No more stupid than a disc priest who puts a 30k shield on a tank before he pulls. Although I don't see stacking a pally bubble up before pull to be very mana efficient for a paladin because the bubbles don't last an indefinite duration and they wouldn't have time to sit and drink to replenish the cost of the heals they cast to get that shield. Pally's mana costs are also getting an increase...

Although, I see this change making it more difficult for disc priests to justify their raid spots when a paladin who were already somewhat superior for the role, is now getting this buff. Disc priests had more prevention, and so while they couldn't heal both tanks at the same time like paladins could we could bubble one and heal the other .. this wont change, but a pally certainly looks more attractive when he can effectively heal 2 tanks at once with beacon and also build mitigation bubbles on his target mitigating how much damage he takes.

Which is worrisome for a disc priest, because the changes to external mana restoration puts the final nail in the coffin of bubble spamming for raid heals -- and although in 10's I can tank heal and add additional raid healing fairly effectively with prayer of healing, doing double duty already taxes my mana -- and in 25's I imagine it's impossible to do both.

Le sigh.