How can you agree with two opposite oppinions ?
I think that I need to clarify, of course I meant your two different principles and not the direct oppositions to each other thesis. For making a super summary you were talking how what make different a move is its innate property (frames, ranges, etc...), while Destruction was focused more on the different execution behind it. My personal opinion is that both are sides of the same coin and act to make a moveset different from another.
I agree Lulu with your comparison between Jacky and Jann Lee, but at the same time it's also true that what make different the two is also a more hard execution of the VF character in comparison with the DOA one.
Often I read in various online comments the tendency to think that more a character is easy or cheaper to use, more has to be snub who uses it for being someone that like to win easy or not put too much effort in the game. I don't think so, for me a player that use a character more easy is worthy of another that use one harder (and if the game is well balanced, even the rewards should be different according to); however even if this difference is something not good or bad in itself, I like it because indeed adds diversity to the roster (and keep in mind that I'm saying this as a player that is far from being good in the execution and that hardly can perform the most complex ones).
You can use the Ba Ji Quan with both Akira and Kokoro, but if you are using the first one is very likely that you were able to master his (in)famous kneel: not only the ability to do it can work as a sort of self-satisfaction for the player (exactly because it's not something easy to do), but at the same time this alone create a deep gap between a way or another to use the character. Overall because often these moves are not randomly hard but strategical because important "supporting" ones giving the player the possibility to adopt a certain fighting style (often very effective) rather than another: yes, there are some like Hayate's Raijin that are just a cool demonstration of style but that can easily to not be used at all, other as the already mentioned kneel of Akira, Jacky's flash sword kick, Raidou's EGWF or Phase'4 mastering of teleport timing that are fundamental for expanding the moveset's potential of the character.
But like I said I also agree with you that this alone is not enough, then is necessary to bring moves that are visually different and with different properties just like you stated and in my opinion this is something that has to come before the eventual addition of an harder execution.
Of course just my 2 cents, I'm not pretending to be right or wrong in absolute and I'm the first one to admit that my knowledge of the fighting games is basic.
Kronin is an optimist
Just when I talk about other people... I'm completely pessimist toward everything concerns me