here is a topic that explains alot
→ Faster Hit Recovery / Stun /Diminishing Returns / Immunity Frames / KnockBack / Player Vs Player - #20 by Picaro-21167
if you add new stuff to the game that isnt based on the Frames on which the Game runs on
you go against the core fundamental Game design and create a scenario where you make every single input ( frw , skill , fcr , fhr , fbr - Frames and so on obsolete and suffer the flawed interactions of these mechanics
such thing can not ever be done like adding a bit of some nasty human excrements to a 5 Star Chef Soup will ruin it no matter how well the Soup was made or how good the Chef was