They should have made them recuperate charges if anything (instead of potions), by introducing them, they didn't acknowledge the lag and animation issues PvP already has(and about which people were already vocal about). If you press a potion you most likely gonna delay your next GCD and cant use another offglobal cooldown (like smite) quickly, that is the biggest trade off, as there are situations where you need to burst but also potion. It is just a mess.