Yes I'm aware of this and this was actually what I was referring to: that if you would expect players to play following this announced developer intention, the players would not actually be able to beat the content when it's first released (before gaining more tomestone gear). Because of this, it's ridiculous to use this as an argument against healer DPS, because pretty much no one is actually playing according to these developer intentions. It would actually be interesting to see how long it would take for groups that aren't the world's best to actually beat any content without healer DPS.
This is not a necessary correlation, though: they might as well tune the content in the way that it's beatable by previous tier's raid gear (or new tier's HQ melded crafted gear) including healer and tank DPS when pushed to absolute maximum. The result would be pretty much the same.
Again, I know this. I have read the post. But what the developers said doesn't matter, because 1. the calculations might as well be based on how the players actually play and it wouldn't make a difference, and 2. because no one actually plays following this "developer intention". There's no raid group that says "yeah we could beat this right now but the developers meant us to beat this without healer DPS 20 item levels higher so let's wait". It's a fact they've said this, but it doesn't affect this discussion in any way, since it's not relevant to how the game is actually played.