I told them that I don't like have to track separate users per day for lots of little things. Coming from races, subclasses, feats. It adds bookkeeping and slows down the game with decision paralysis. Things like Superiority Dice or Sorcery Points are one currency for multiple things, not nearly as bad.
I also said that if you are going to have a limited usage ability, make it meaningful so that even if it only happens 2-3 times per day it feels like it's one of your character's defining points. Many of these things are "add an extra d8 of damage PROF times a day" that are just boring even if somewhat effective.