I won't say Sonic's moveset is particularly interesting to me, but it does grate on me a bit when people point fingers at Sonic frequently rolling into a ball as its greatest sin. I don't know how to break it to everyone, but that's kind of his most iconic ability. Especially since Sakurai opted to go for more of a classic angle, maybe that clashes a bit with the modern design but I know he's talked about the simplicity of Sonic controls on Genesis and seeking to channel that.
If we break it down, what are Sonic's most offensive or redundant ball moves? Clearly Side B and Down B do not need to do the same thing, so one of those can be abandoned. Personally I'd retool Side B, since pressing down to Spin Dash is more accurate anyway. I kinda like Up Smash, but it's not totally necessary.
Side note, I actually think his original dash attack where he simply rolls forward was more fitting since... well, idk, he does that in the games when you press down during your forward momentum. The new one is okay but of the ball moves you could change that one felt fine. And they changed his Down Smash, which funny enough was way more unique when it was a spin move. The new one is really similar to Fox and Falco's down smash - it should probably be a breakdancing move or something.
So that's two ball moves that I think could go (and one that I think should have stayed). What are the other ones?
Homing Attack - Well, yeah. He should definitely pose after he hits you, but otherwise this one is obvious.
Spin Dash - Again, obvious. This one doesn't need to change although I guess they have to decide if they want to keep it closer to the Side B or Down B.
Neutral Air - This could be stylized a bit further to look like the Insta-Shield from Sonic 3, but it's a perfectly fine and fitting attack.
Down Throw - Honestly? I just think this one is really cool.
After that, if you want to be difficult, you might bring up Sonic's get up attacks. Beyond that, we are looking at 6 ball moves - only one that is especially offensive and another that is questionable at worst. There are many valid complaints you could make about the way Sonic has been implemented but I can never really take this argument seriously - one of the most overblown complaints in the series and I feel crazy whenever I look at Sonic's moveset and think yeah it makes sense for Sonic the damn Hedgehog to be rolling around a lot.