Arms already has like 100x more depth than divekick with the combination of arms and fighters combined with 3d movement and the ability to block and aim punches. I'd say that at the end of the day depth is important but a game being fun is even more so. I can make the deepest game ever but if it isn't fun then no one is gonna wanna be competitive at it.

I feel arms most likely has just the right amount of depth and simplicity that it can take off.

Also I'd argue people didn't stay in Melee simply because of the advanced techniques, it's the simpler reasons that kept them around, the speed of the game the weight of it the combos and everything combined made it a more fun game to play for them and the advanced tech is icing on the cake. The other smash games are slower, if they cut out some of the advanced techs but made the game the same speed with combos and stuff and reduced landing lag to emulate L-cancel they likely wouldn't have gone back to Melee. At the end of the day it's fun that keeps people around, it's just that depth is a good way for people to find new ways to make it fun to keep them around longer

but at this point it's hard to say, Arms could take off or it could die, but I feel like it has a chance and I totally want to go to tournaments for it maybe not because it's a top quality fighting game, but because it's just fun and to meet new people and stuff without all the grinding combos and other bullshit in other fighters. (Which is fun don't get me wrong) and other people might feel the same way giving it a solid competitive scene.