Why dont multiple sch shield stack?

[Lyrica_Ashtine]

You say that, but even when I crit for 3000 the shield goes down extremely quick where as say mid battle if you have two regens on the tank it's gonna get him back to full health in 3 seconds on top of that if you divine seal it's even more likely that the tank won't need much healing. If it was two scholars the tank needs much more attention, because we don't have regen.

Regen with full i110 with HA weapon ticks for 470-480 on average. Add in 40% of DS that's 650-670 on average every 3 seconds. Claiming two DS regens will heal a tank to full in 3 seconds is complete nonsense - Unless you are talking about a level 30 tank. In fact, a single fairy heal would easily outheal a single DS regen tick with one embrace - Which is also once every three seconds.

Assume you failed to read this post, I'll quote myself:

Same reason why stoneskins don't stack: Two White Mage stoneskins on a 10k HP warrior is 3600 points worth of damage. Two adloquiums on the same tank is good for ~2500 points worth of damage (up to 8000 with healing buffs up)

Having multiple HoT spells doesn't save you from getting killed instantly (Death sentence, Blighted Bouquette, Raven's beak etc.) but having two stoneskins or two galvanized (especially when it crits) allows you to go #yolo on too many things it would break mechanics.