Why? There's no problem unless one of you die. Are you implying using your defensive cooldowns will slow down the run?
If the run ends with no casualties and no slow downs due to a healer's behavior then that is all that matters. Whether you dropped to 1% or stood at 100% all the time is irrelevant as long as no delays were introduced. As far as I know, using defensive cooldows won't introduce any delay.
It seems to me the rant is about you feeling uncomfortable and quite honestly, that's mostly your problem.
We still do that focus thing?
------
On another note, I have a hard time understanding these arguments. The game has pretty much no situations where this is relevant. All roulette dungeons and trials are faceroll easy and the few hard challenges are beyond these petty complains.
