For me it's really as simple as doing whatever I can to speed things up and make them more interesting. Assuming everyone in my party is competent, I'll have nothing to do for 5-10 seconds whenever I drop a crit Adlo. Why wouldn't I Cleric Stance and do some good? It just seems silly. And you almost always get 5 seconds of free time at the start of a pull if you Adlo'd your tank beforehand as well, so it's just making use of all your tools to clear content faster and make people happy. Most dungeons can be entirely Eos-healed so I'll just never leave Cleric Stance except for the initial pre-pull Adlo. I've yet to come across a single tank that didn't appreciate a DPSing healer.