Quote Originally Posted by Renathras View Post
They don't allow shield stacking precisely because it can cause some funny business with cheesing mechanics, and they don't really want that.
It's worth noting that the only shields that can't stack are barrier healer GCD shields. Basically, Eprog. They added a shield to Holos that's almost as much as a plain Eprog. Neutral Sect shields also stack with Spreadlo.

I'm quite certain that allowing Eprog to stack with Galvanize won't make the slightest difference when we already have Spreadlo and a huge range of stackable mit, oGCD shields and tank lb. There are no lethal mechanics you can skip or ignore by adding a Zoe Eprog to the current selection. We can already stack ridiculous shields and mit and Eprog is a drop of water.

Really, they don't have a legitimate reason. They just don't want to change it. Same with many other outdated things on healers, their tiny job design team is already strained simply lining up SGE/WHM and PLD with the 2 minute burst window and heal reworks are bottom priority.