I know but even when this game is finally released and it's not as much of an issue to get abilities I feel like a new player pretty much just equips it and never takes it off, certainly that's how I treat all new content why would you ever take it off once you've got it if you just want to keep getting new abilities.Most of the Mirror Stance move steal lockouts are temporary. Many moves only accessible by mirror initially get added to one trainer or another (or to a tome) after a few months' worth of patches.
It feels to mandatory for me, to much of a nuisance. It's not exactly a game breaker, just something that annoys me.