It's fine if every aggressor only needs to adjust the timing of their attacks for combos to be consistent, but when you have attacks that just completely don't work on a character, it's just stupid. For example, you have Heihachi's F3-22 just not working on Sly and Nariko's aN3 > aN111 not hitting Fat Princess at all.
Furthermore, moves with a blind spot in them, such as Nariko's U2 and aU1, have their blind spots seen more more apparent when fighting characters like Fat Princess, Sackboy, Sly, PaRappa, and even Kat.
Is there even any justification for DRASTICALLY differing hurtboxes? It's fine if there's SOME variation, but there needs to be more of an average among them. I mean, in gameplay, it's not like players playing smaller characters are ACTIVELY doing anything that gets them out of jail for free against moves that don't work on them, so what good reason do they have given that characters like Kat, Fat Princess, and PaRappa have very strong combos, confirms, mobility, or other tools?