in a game with fox l-cancelling is kind of a necessity
You know, I understand that Fox is a very good character, arguably too good in some people's eyes, but I think that might be overestimating it a bit.
If Fox gets "better" with Auto L-Cancelling, so does every other character in the cast. However, I'm under the belief that absolute no techs and abilities with any character at high level play is processed and planned with the possibility of
not L-Cancelling in mind anyway. Basically, everything is done and thought of with a successful L-Cancel in mind automatically. That tells me that nothing would actually change aside from having one less button to press and a less pointless margin of error.
Inversely, if he doesn't get any "better" with Auto L-Cancelling, neither does the rest of the cast. They're all still the same. Either case depends solely on the player themselves.
So as much as I know you won't like this answer, it's pretty much the same one that's given on the flip side of this argument so, if you want to beat Fox in a game with Auto L-Cancel...Then simply improve further with your character using Auto L-Cancel.
In other words, "git gud" as some of you like to say.
Asking us to get better with L-Cancelling in play apparently has never been too much to ask in the defending side's eyes for the past almost 2 decades, so I don't see why the opposite would be.
Or maybe I'm just being pretentious and ignorant. -shrugs- I dunno.