This thread feels like an epithomy of everything that's been going more and more sour about the game as the years have gone on. Canary in the coal mine for the gameplay and encounter design stagnation in the last couple expansions and increasingly aggravated and polarized community splits.
Optimize, homogenize, simplify the fun and quirk out of everything and make the fights as scripted as ever. Referring to the huge bulk of your game's instanced encounters - dungeons ,trials , 8 and 24 man raids - as purely casual with the weird expectation and conformity that as such they should just be as braindead as possible is by far one of the worst takes anyone can have on the matter too. Thats the meat of your PVE gameplay for your entire playerbase, aside of the ones who would want to face an extra challenge in savage/extreme/ultimate. Half of that content is obligatory to go through either for MSQ or for your daily roulettes and you WANT that part to be a boring slog? Same mechanics for the past decade repeated ad nauseam and a core job loop that puts you to sleep? Is your point to play the game in earnest and have fun with gameplay that tickles your brain at least a little or to only half-pay attention while watching a series on your second monitor ?
Saying its ok to not use 90% of your kit as a healer for content also feels terrible. It shouldn't be the norm. Why do I receive abilities if I only get to use them once in a blue moon because there isn't enough damage output from bosses in majority of content and everyone already just heals or shields themselves in some capacity anyway. Or saying that the chaos of people performing poorly and eating mechanics and dying is acceptable to make up for bland encounters lol - just expect and hope everyone in your party is bad just so you have something to do because the devs didn't give you anything. Its just undercooked design across the board. And for healers , as stated by so many people here beforehand , that has been the case for years.