RyokoYaksa is obviously somewhat of an intelligent poster.
But to put it bluntly, after reading your responses, I can only say that you don't have a clue about what you're talking about. The degree of which you are underestimating Mario and Zelda's options are rather absurd when compared to how much you overestimate Sonic.
Please come back after actually playing a Sonic main or actually asking Sonic mains about what they think about the move. :\
Sonic's Fsmash should NEVER HIT SOMEONE PAYING ATTENTION. I'll say that again and again. And even it does (somehow), he still has to wait for a long time when compared to other characters, including Zelda and Mario.
Sonic's Fsmash leanback should be a perk, not the entire reason for its existence. Sonic's Fsmash is just too easy to avoid for an entire match, and DI until very high %s even if you do. This is just for the move itself though. You also need to realize the fact that Sonic has no realistic KO moves outside of Bair and Fsmash. Bair and Fsmash do not kill at regular %s, and both are very slow to start up, making them easily avoidable on reaction. In other words, Sonic has to wait for a long, long time compared to other characters to get a kill. And even when they somehow get to that % after a long, grueling battle since Sonic has bad combos, Sonic has to wait for them to severely mess up once again before even getting a chance to land one of his "kill moves," and then they have to pray that move will actually kill in the first place. :\
Fsmash needs to be buffed as both a niche move and as a standalone move. It SUCKS. Stop being dumb and running into charged hypnosmashes.
Sonic is only a threat to dumb people who have no idea what he's capable of. As soon as they realize that he's not capable of anything, Sonic should never win a match.