I definitely disagree with that.
In DK vs DDD, DK can play the match. He can try to space as well as possible, and if he does get grabbed the infinite has a 300% cap. The match-up is still playable.
Dedede WILL KO Donkey Kong once it reaches 300%, if they even desire to wait that long.
It's not playable for the entirety of the time the Dedede is chaingrabbing.
Both characters are still in full control of their actions in Sonic's case.
In sonic vs falco on ps1, if falco loses the lead the game is no longer playable.
Wrong. Again, they both still have full control. Falco can also STILL assault Sonic under either level with lasers.
He is forced to either SD, or wait for the clock to run out. I see a clear difference.
If Donkey Kong is losing vs. Dedede, or Ganondorf is losing vs. Ice Climbers, they must force themselves into a terrible position no better than Falco vs. Sonic, or wait for the clock to run out.
It's the same thing. Falco is being put into an unreasonable large hole just as Ganondorf and Donkey Kong are. All this is is an indication of a bad match up.
Of course this is assuming sonic's HA camping is unstoppable on ps1.
By a majority of the cast. 2/3rds, that is, which means of the 39 characters, 26 of them have to be unable to reach him.
Anyone with projectiles can reach him (except Zelda/Sheik, though on many levels they can simply jump down and assault him). Anyone with multiple jumps is fine. Pokemon Trainer is fine because he can just switch to Ivysaur.
For those that have to physically assault him? Wait for the HA to trickle over to the edge of the stage, and punish him.
I severely doubt that 26 characters can't stop it.