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EPsilon933
While I respect the fact you were willing to put out a video talking about L-Cancelling, its just plain wrong in many regards.
1. L-Cancelling lacks a risk/reward dynamic
This criticism is warranted when a mechanic is implemented with the intention to create risk/reward but failed to do so. There are no signs this was ever the case. Calling L-cancelling out for lacking risk-reward is like disliking wavedashing because of it.
2. L-cancelling turns players away
This is entirely your speculation. One could just as easily argue that L-cancelling can draw players who like pushing buttons. In fact, I would contend that L-cancelling is a great entry technique because it lacks theory; the implications are obvious and mastery gives immediate gratification. Couldn't that suffice for foot in the door?
Regardless, at the time that video was produced Melee, had eclipsed its predecessor in popularity in spite of the L-cancelling barrier. Saying it turns away players when this is the case only serves to discredit your argument.
3. L-cancelling makes the game campy
This comes off as speculation once again. Melee currently has the most aggressive meta out of the three smash games (probably due to the fact its punish game isn't as extreme as either 64 or Brawl so "going in" isn't as risky).
4. New players like Project: M because it easier
Again, speculation. You fail to cite that Project: M still
has L-cancelling. If anything, you only prove that L-cancelling is a non-factor when it comes to impeding players.
5. Reacting to a missed L-Cancel is outside of human reaction time
Wrong, because you are reacting to what your opponent is doing after they hit their aerial. If they are stuck in landing lag and aren't shining/dashing/etc. after 12 frames you would notice.
6. L-Cancelling is an arbitrary input and its interaction with a shielding opponent is its only marginal contribution to depth
Arbitrary or not, it still affects the player and still adds depth. If the player has to L-cancel after they land an aerial, can they fully react to how the aerial interacted with their opponent? Even if L-cancelling is habitual, its still an instance of multi-tasking. The implication of L-cancelling affecting reaction times is a perfect example of technical and mental depth interacting.
You see, I think the main area where you falter is you fail to address the merit of technical depth. Why can't inputs be just as valuable as mind games? Is there nothing to be said about mastery of the controller as well as the mental battle outside the game? Do you feel that the ultimate reality would be the day we can just plug our brains into a computer and control fighting game characters with our minds? Inputs/execution, no matter how arbitrary you feel they are, add depth to the game because they create a limitation. This isn't to say they shouldn't be balanced, but through limitation, we create metnal/technical interaction and thus, more depth.