It would make the parry too good probably.
Chin has a 1 frame parry/counter but he doesn't have a meterless invincible reversal like Ryo does.
Well, if Ryos parries were say 4-5 frames of total startup instead of the current 7-8 (i think), he would still, unlike chin, be unable to use them against meaties etc and they wouldn't come out on button hold so they'd require manual timing aswell. I don't think they'd be overpowered if made faster and since ex moves are only available in max mode he wouldn't have any launchers from parry anyways. The worst he's going to hit you with if he isn't in max mode is a super of some kind, unless they make parry max cancelable wich could be crazy.
And Chins counters are too good in 13. Playing against Chin is practically mental suicide because he is one big (small) dynamic 50/50 machine. Doesn't matter who's on offense, everything is Chins mixup and it all leads to corner carry and 500 ish damage. I hope he's more sane in 14 because i do like him, stupidity aside.