Chris Parker
Grandmaster
Chris, do each one of those have a different way to punch that is unique to each and every system, no overlap?
To a fair degree, yes. The commonality is that they strike with the fist. That's it, when you come down to it. The fist is even formed differently in a number of the different arts.
Elder - Is a Kyokushin punch that different than a Shotokan punch, and for that matter that different from a Taekwondo punch?
Yes.
What is the difference between a punch in Wing Chun and a punch in, I don't know choose any Karate style?
A Wing Chun punch features a different structure to the fist, different body mechanics, different methods of generating power, different stance concepts, different angles that are used, different targeting concepts, and more.
I am not talking about changing the arts or their approach. I am talking about having basics that are known and agreed and a starting point for the arts.
Which doesn't work. I train in five different sword systems. Each has a completely different grip, cutting mechanic, and, well, everything else. Even though they are all Japanese sword systems, using essentially the same sword.
And yes, I think Black Belt is the beginning of understanding.
But the beginning of what? The way you've presented this it doesn't offer the beginning of any martial art at all, as you'd need to start again, and correct everything from what your "generic" black belt would have taught.