Yes, I would want the healer to use their GCD to heal me if I am going to die otherwise.
We both know you do not have any more objective data than I do on this subject. We both are only drawing from our own subjective experiences. You are making a claim that healers have something to heal nearly all the time, which a single counterexample would disprove. Thus while my experiences are subjective, they do serve as this counterexample.
If you have objective data to show that healers rarely have free time to do things that aren’t healing, feel free to present it and I will happily eat crow.
If we miss the timer by 10 seconds and the healer contributed 0 damage, then yes, some of the culpability falls to the healer. Asking DPS to do more is certainly also a way to solve that problem, but the effort required for a healer to go from 0 DPS to 100K DPS is lower than for a DPS player to go from 4M DPS to 4.1M DPS.
I explained exactly what is wrong with it. If you knowingly choose to spend an ability that is 100% overhealing, you expended a GCD, possibly mana, possibly some other resource, all to gain objectively nothing.
This is not the comparison I made. I said overhealing would be worse than doing nothing.
Where on earth did you come up with that? I said right in the quote you included that overhealing commits a GCD.
Is it? There is zero return on investment if you cast a healing spell on an ally that will cause zero healing. But it costs you at least the GCD that could result in you being unable to react quickly enough to another damage event later. It also might cost you mana, secondary resource like holy power or essence, a cooldown charge, and/or a random proc that you now also will not have for future healing.
The most important part of what I said and you quoted is overheal. It’s bad for healers to overheal. You removing the over to just say “heal” is the nuance that you are intentionally leaving off.
So now you’re the one who’s avoiding questions, eh?