White mages didn't care before and they won't care now.

As for AST/SCH, I think it depends on incoming damage rate (because if we're just healing 17-20k over 10 seconds, the problem is laughable). If the tank is taking more damage than what the healer can push in that one GCD, then the tank will never reach full health. I know from experience that an AST can burst-heal 15-18k within 1 GCD, but that's with crits and relying on that kind of luck doesn't hold in the long run. And then there's Synastry, of course.