To be fair, if you can make the decision to eat a vulnerability stack to get a tiny bit more uptime and dps on the boss, utilize a potion to do this and pull it off successfully, you aren't playing at a braindead level. You're making use of your toolkit. Potions are on a cooldown, it would be like another Second Wind you can use every so often, not something you can bring a stack of and spam on every mechanic.

Timmy Floor'Tank the casual DRG probably won't even bother to bring potions, let alone utlize them effectively. It's something high-end players would use to squeeze some extra utility. I'd be fine with that.