You're trying to pick and choose select portions of the conversation, and you're getting what I said out of context in the process.
Healers who refuse to do anything during downtime is one of the topics of this thread. (Actually, it's one I can agree with you on in most cases.) But grading a healer's skill level based on how much DPS they can pump out is also a major part of the discussion. I don't agree with the people who say you're a better healer if you leave everyone skirting the edge of death while you just focus on getting out as much damage as possible. That might make you a better speedrunner, but not a better player.
And I got into this conversation in response to other claims that tried to prove more DPS was clearly superior based on the fact that it can shave some time off the run. That's purely a speedrunning consideration.
You say that as though avoiding the mechanics and just burning the boss down at every opportunity would make it less repetitious. The mechanics may not have as much variety as you might like, but they have more variety than that does.
Making the fight shorter allows less time for error, but since it also makes the fight more hectic (and in the situation I addressed, a lot more precarious), it increases the likelihood of error during that time.