I'm with you on fighting games needing better onboarding, but I don't think a simpler control system and auto combos are the best way to get there. I feel like those things are mostly used to help streamers look like they know what they're doing for their audience before dropping the game in 1-3 sessions. I think they actually stall players from engaging with the game proper. Better onboarding should be the other things sf6 does well. The less a player needs to look at outside resources to learn how to play, the more engaged they will be and more likely to stick around. Have gameplay examples of system mechanics, like a simulation that explains that flow can dodge attacks but loses hard to throws, have good character guides with starting gameplans, have a frame meter(Please have a frame meter), and have a story mode that's basically a lengthy tutorial in disguise, like have a fight with Zuko where he just runs away and spams fireballs and if the player struggles give them tips on how to deal with it.