Well, i don't know, since i don't a single idea of what direction they want to take the game, neither what they are planning to do to overhaul it :/
I only know, that right now that all the top tiers are at the top mostly due how they are capable to abuse the current system.
Depending on the changes that they make to the system without counting the changes to the characters many of them could become bottom tier easily imo.
TBH i wouldn't be surprised if this game doesn't have Hitstun scaling at all, btw does MB (any version) have hitstun scaling?, I only play MB casually so i am not in touch with some of the mechanics
They really need to add more stuff for the defensive game, i guess that they thought that maybe it wasn't necessary due how ridiculous are some of the normals of the characters with their range and all of that