Supa
[10] Knight
I find it funny that people tend to base a character's overall safety on whether or not Pyrrha can punish. No sarcasm here at all, just lol.
It's traditional and practical. Stab has always been a relatively low frame punish that's very easy to do and has a high reward into possible combos, etc. You wouldn't compare everything to Natsu's AA or Yoshimitsu iMCF since these don't really work as the best punishes even though they're faster than stab.