Do you have any idea how OP that would be? A command grab that's only dodgable by reading that it's coming, that is also essentially a combo confirm? (do jab right after, follow up)
but why let SOME characters roll right out of it while others have to tech
ganon's grab is already unreliable and hard to even grab with, so his side b is basically his best chance at a grab: they should either have to tech out of it or get hit, not "well lets make half the roster able to roll / attack out of it and the other half have to use some skill to get out of it"
before someone says 'git gud', i grab perfectly fine with everyone else: you try landing ganon's grab