I don't see how that is an issue.
In various situations, it is extremely annoying - every game I've played so far had 2 bars in the group-windows

Or, you can use Swiftcast and cast an instant Stoneskin.
didn't think of swiftcast yet - other than that, see above


I have no issue with MP consumption. Regen on tank(s) at all times, Cure on DPS and tank until Free Cure, which I don't even use every time as there's not always a need, as Regen is so effective. Shroud of Saints once my MP hits about two thirds of the bar and don't spam Cure if Regen will take care of the damage.
which is just logically - guess it's just slow DPS in some cases then