Do not like the less healing potency insta cast Physick, we have Lustrate for that and I don't have any issues with the stack requirement. This sounds to me like a needless waste of mana when you can just use a stack to heal 20% instantly.

Personally don't think Physick among other spells needs to have something more special to it. We already have the chance of increased cast speed buff given by pet when you crit with it.

I think its just there so you have options on your sub, level acn or whm and you get to take physick or cure on your other classes.