One can talk about "historical" in rather loose terms or meaning something quite specific.
"Historically inspired" is the correct way to describe what usually is called "historically accurate" on todays market.
By using the word "historical" we must mean to compare in some way to something that actually did exist sometime in the past.
How much we aspire to compare will always be limited of what we know.
By using the words "historically accurate" we must aspire to somehting quite exact, or we denude the words of their meaning completely.
Historical swords are what they are because of crucial functional spects. The most important aspects are not even remarked on in the popular typologies, used today to classify swords. You need to see these swords first hand to get an idea of this. Or even better: get to handle them (a sword might give you one idea of its character from its looks, just to become a completely different beast when you get to hold it).
Just because a contemporary sword can be sorted and classified according to
Oakeshott or
Geibig, does not mean that it in any meaningful way is "historically accurate". It might look like a "typical" historical sword, it can have the general size, mass and perhaps even
point of balance of the historical swords it aspires to replicate (even though all these vary). But it can still lack the actual character of the ancient swords.
So how could we be sure we hit the mark with all the variations given? How can we know what combination and set of variations are within the type? How can we say anything about what is atypical, if published texts and typologies does not even touch upon the nuts and bolts of the design principles?
-Only, by doing first hand studies of actual historical swords! Knowing one sword will tell us the specifics of one specimen, knowing a hundred swords will tell us something of the principles for thher design.
"Historically accurate" must also be specified as to what aspects it is meant to cover. Do we talk about material and making? Do we talk about style and looks, or do we talk about perfomance, handling and functon? Do we aspire to all these things at once? How much can we honestly try to cover? What aspects do we actually know enough about for our work to aspire to being "accurate"?
To some extent these aspects overlap, but not completely. You can make a focused study of a few aspects of the historical sword and happily leave the rest without regard. As long as the focus of the study is clear we can still talk about historical accracy.
It is common that you hear that a blade is forged with accurate tools and materials, following some hopefully accurate manyfacturing technique. The resulting sword can (and will) often look quite different from actual historical swords. In those cases the maker is interested in the craft and the materials. That is a worthwhile effort, but there is no guarantee that the resulting sword is in anyway similar to a historical sword, if it does not share the physical dimensions and dynamic properties of an original. Such a swords might be accurate in materials and techniques, but nothing else.
How a sword functions is primarily not about materials or manufacturing techniques; it is about design and dynamic aspects.
If you aspire to know about hitorical swords and be able to have something to say about what is accurate, you benefit by a personal study of actual historical swords. If knowledge is based on what is covered in publications on historical swords and swordsmanship, you are relying on second hand information at best and never know what is the prejudice and specualtion of the writer or what is actual facts. This holds true for both makers and users. Whithout first hand knowledge of and experience of histroical swords, the terms used to describe them then become quite shallow.
If you base your knowledge primaily on what is availeble on the interent, you are unfortunately on very shaky ground.
If you take part in discussions or make swords where the quality of historical accuracy is in focus, it is good if you name the source of your infomation to the benefit of your fellow enthusiasts.
Making a "copy" of a historical sword based on data limited to length, weight and perhaps point of balance, does not really come close to something that could be labelled "historical accuracy": there is far too much variation possible with only this information to build on. There is *no* guarante the "replica" will come even close to the original in performance or handling. Even if they might look somewhat similar when comparing photos, they could be two completely different swords seen side by side, when you can appreciate the difference in heft and dynamic balance.
The most important aspects for handling and performance in a sword cannot be described simply by length, weight and point of balance.
When you make up your mind about the "accuracy" of a design, you must consider where the maker got his data. A second hand source? Text in books? The internet? Generally acepted ideas among contemporary word afficinadoes?
Personal research on actual originals?
The outcome will be greatly influenced by this.
By saying something is accurate, it must mean that it can relate to something in a specific way.
If you allow it to be a very general and relative term, it becomes as meaningfull as "battle ready".
By saying all this I do *not* mean that there is only one way to make swords: by apsiring to historical accuracy.
I do think that both makers and users would greatly benefit from personal study of originals, regardless what the objective of the interest is. It would help a better understanding of the nature of the sword in its multitude of forms.
A badly made sword based on questionable research does not become better just because it is called "historically accurate".
A crooked length of dirty steel does not become a brilliant historically accurate scrama
seax, just because it was made from bloomery iron and forged in a charcoal hearth.
It is possible to make an absolutely excellent contemporary sword without it having to be in anyway historically accurate. It is diminishing both for the maker and the understanding of the work if that sword should be labelled as such, however. Also, by making the distinctions blurry, we do not help our understanding grow, but instead get bogged down in the murky mud of shallow thinking and prejudice.
The sad thing is that "Historically accurate" has become a marketing term used to increase the allure of products that are anything but histroically accurate It confuses things, to put it mildly.
In those rare few cases "historically accurate" actually means what it says it will still only mean this: the object relates in certain specified ways to original historical objects. Wether this is something that is to be appreciated or not depends on your interests. If you like to learn something about the reality of the sword when it was actually used: accuracy towards historical examples would seem to be of great value.
If you are fascinated in a general way in long sharp blades, it can matter little.