Can we stop punishing shield healers for playing together?

[tdb]

Why is it "obvious" that GCD shields don't stack, when GCD HoTs from WHM and AST do? I guess SE doesn't want to add that cushion to barely-survivable tankbusters, but then the question is does the content need to be designed that way?

I hadn't noticed that the oGCD shields do stack, so that's good at least.

Edit: Also, what of the issue of gaining addersting stacks for Toxicon, especially if there's two sages in the party?

Edit 2: I don't know what kind of groups you play normal content in, but I do it through DF. Every so often I land in a group which just can't do mechanics, eats damage like a sponge and dies all the time. In those situations I'd really rather my tools didn't conflict with the other healers'.

Edit 3: I could do a whole rant about how healer design in this game is bad and why does SE give us so many GCD heal buttons which end up sitting unused most of the time. But this shield thing happens to be what irks me right now.