Not to discredit any Ganondorf mains, but this general attitude with Ganon and him "going even" or having little troubles with so many members of the cast solely on the volatility of his toolkit seems like a large overestimation of the character's capabilities. Yes, Ganon will destroy you given the chance in a couple of hits. Yes, no player can attest to perfect execution and deny mistakes will happen. But to assume Ganon won't make those very sort of mistakes or won't be given the proper respect that grappler(-like) characters demand is pretty absurd.
In GG:Xrd for example - and pardon the cross-game comparison - Potemkin, the game's only true grappler, is generally considered to be at the bottom of the cast in terms of competitive viability. His mobility options are not poor, but terrible in a game that prizes freedom of movement (sound familiar?). And yet taking a gander at Japan, one can see a player called F.A.B. dominating other experienced Guilty Gear players with this character. His results speak for himself, but does that automatically assert Potemkin as a well and viable character? Personally no, I do not think so. Potemkin is still a slow, largely built character with the potential to win in a few reads, but smart players will put themselves in a position to minimize said risk and mount their offense around his massive hitboxes accordingly.
Pit won't be running off to grab into your Ftilts or Dtilts. No, he'll be pressuring with arrows and using his generous disjoints to keep Ganondorf out and safely approach. Ike will be hitting with safe on shield Ftilts and Bairs. Peach will be laughing the game out as she hovers with a turnip above and by the time he gets to punish Mario, Ganon will most likely be catching up to his lead if anything. Ganondorf is a scary beast with the potential to wreck almost any character in the game - I would argue every character in the game. However as the relative skill ceiling of Sm4sh's player base increases, so will increase the difficulty for Ganon in a meta were people won't be making as many questionable calls on shields or giving up free stage control or edgeguards to a character with this magnitude of strength.