What are the cons of auto cancelling though? It's not as if when you take away the L cancel tech barrier, all of a sudden everyone can play like robot M2K Marth mode. Taking away L cancelling and replacing it with auto cancel/less lag universally does not mean players will be on the same page strategically or technically as the pros. Taking it out will not turn every Falcon Dthrow into a Hax/Darkrain combo video. It won't lead to every Fox player ever being able to waveshine flawlessly. Etc.It's only seems meanless if you're already convinced that tech skill is a bad thing. Even then it's take it or leave it with the pros not out weighing the cons of auto canceling. There maybe a better alternative for endlag but its certainly not auto canceling or screwing with the frame data.
I feel that there are already enough gameplay "nuances" or facets to master that can visibly put a pro over a different player, that you don't need L cancelling to "separate" the lower players from someone actually good. Knowing which DI or SDI is best for the situation, knowing your CC options intimately, being able to on the spot vary and extend your combo based on their weight, character, %, and DI/SDI choices. Knowing how to edge guard and/or recover optimally vs the cast. Knowing stage boundaries and features. Having strategy for baiting and for approaching. Knowing your OOS options and how their effectiveness may change based on the other character.
To me, it doesn't serve to enrich the game when you have an alternative that arguably would then let players focus more on the "next step" of gameplay and get some of their strategy and combos down better to begin with.