That is the issue, and it's a problem especially with very old arts, which have almost certainly evolved (purposely or otherwise) from what they originally were. Along the way, it is possible they lost their original designed purpose. I think highly experienced instructors are at risk of helping this happen - the better we know the art, the more we think about tweaking it, and perhaps the more we overthink it.
So, even an art that was originally derived from highly effective civilian defense can possibly turn into a dance of misunderstood movements. IMO, sparring with other styles helps highlight the dancing, so it can be eliminated.
I'm really not arguing any sort of intelligent design.
My position has always been that the skills necessary to land a punch or defend a punch are independent of style.
When you watch two boxers testing each other, gauging
distance, seeing what
angles open when they draw out a response, knowing
when to lean out of punches range and when to move their feet to stay safe etc... You are not witnessing anything unique to boxing as a fighting style, only skills that playing the game of boxing helps you to develop.
Therefore if my art punches and I get good at landing punches it's not because my art is awesome, it's because I trained to land punches well.
So where does style come in?
Mostly on a tactical level.
An art like wc emphasises striking while close but with mostly straight shots. So the question for the student becomes what do I need to do to land my straight shot in close?
Specialisms enable both focus on and mastery of a finite skill set, while also defining clearly where you're weakest and thus letting you know what common counters to expect.
So mastery over a styles specialisms in combination with excellence in core skills should make a wc striker as effective as any other striker, such as a boxer or kick boxer or karateka (who are just as likely to be specialised.
And there have been some good counter arguments made to this point, most notably that if the style is both mechanically unsound and tactically weak, your punch can be both ineffective and leave you vulnerable (I'm paraphrasing).
My answer was to agree in theory but:
The TMA tendency to work based on principles rather than techniques enables pragmatic variation of the form of the techniques, for which Alan Orr and the Aikido training video were both examples.
Second (not sure if I said this yet) mechanical efficiency is mitigated by training and use of other tools. So for example, my wc punch would be weak as anything, but a guy with 5 years of practicing that method will hit pretty hard with it. And where a punch might not land as hard, an elbow will, especially if your core skills have let you maximise impact through timing.
In other words I don't think being the second hardest hitter in the ring is that big a deal.
Now, as I said the goal posts are being moved because those striking arts that were the gold standard are now being said not to work.
So fine if you define a styles ability to work based on that which it was not designed for then no style works. Which while it tanks my proposition it also tanks the argument that this thread was intended to counter: that some styles work better than other's. No style works so all styles suck. Your style bashing is still baloney.