More of a "tales from multiple DFs lately" but...
I fully understand that there are players out there who want to sit at max health all the time, I get it. These are very often the people playing "forum princess healers" and to that end I am generally unaffected by them (or have been) since I've done most of my playing as a healer.
There is one subset of these people that irk me to no end though and that's the famous self (or even party) healing PLD and RDM. I am aware that your health is not full. I know. I also know that there is little to no incoming damage and the boss is almost dead. I know that Largresse is up in six seconds and I plan to throw up a Medica II and let the ticks do the work.
I don't know if this has always been as prevalent as I've found it to be lately but when we are running literally any 4 man dungeon as a PUG I don't trust you any more than you trust me. That means I am not relying on someone's self heals to keep them off the floor because frankly most of the people I've seen in DF don't seem to have the sense of self preservation to use these skills in a pinch plus I am still the healer and (to an extent) your health is my job to maintain.
Ffs let me do that job.
I think at this point if I see a PLD or RDM healing themselves while they're above 70% I'm just going to stop healing them. Clearly they want something to do and I'd rather at least one of us prioritize actually killing the enemies.
To make my point exceedingly clear I am not talking about a RDM using Vercure to proc Dualcast or even to spotheal themselves when they mess up a mechanic. I'm also not talking about a PLD healing themselves to throw up their shield (Divine Veil? I think) or even during a megapull to allow me to DPS for longer. This is aimed at the players who use these moves in excess and ultimately to the detriment of their personal DPS.