I wouldn't say they have no idea how player actually play healers.
I mean, Yoshi P played with the community several times (search on Youtube), even on savage, there were ton of feedback since ARR/HW regarding healing/dps/the encounter.
He definitly must have an idea of what's been doing this whole time.

They probably either don't know what to do or, they have their own vision of what the healer role should be, and let player play it like they want (because, there are still a lot of cure I-II-medica-no-ogcd player out there).