I find your opinion worse, either agree with how I view things or get out of playing the game.
Billy said best Context is key with how people are viewed, I give people a very generous window of allowance, from lv1-60 i'll treat them much more coddly, but from 61 onwards training wheels are coming off and my expectations are that of the OP (so like the majority of my encounters in FFXIV atm), I don't care if someone has boosted, it is on them to get familiar with 6+ years of mechanics, job design, community expectations, if they can't handle it go sync down and learn like other people do who don’t pay to skip.
Design of tanks and healers have been made as easy as possible, if you go back to HW, enmity was a real thing tanks had to be wary of and mass pulling could go horribly wrong much easier if you ever had a dps burst 1 mob, cycling to it was a giant pain in a size of 7/8 to ensure you had hate, which also meant less aoe enmity generation. Healers were punished with higher wipe potential if mistimed cleric stance since made your heals pathetic. Both things are removed a tank nowadays has to press 3 buttons for big pulls, tank stance + 2 aoe combo , if that is too hard for people they should go back and learn how, not be coddled, new to dungeon doesn't excuse can't do job as expected, period.
New to Grand Cosmos, cool, why are you stopping on the 1st set of enemies and not even attempting to see if can get more. If a healer doesn't have to heal you, you can pull more. It is always best to do a big 1st pull as you can gauge whether rest of dungeon needs small pulls or your free for big pulls for rest of dungeon, it also offers the least amount of time wasting for running back if fails.
Healers have braindead rotation for their dps, if you can't spare a single gcd heal to DoT up either you need to look at what your doing wrong or the tank needs to, be it gear, skill usage, what have you, no excuse for pure healers, that stopped being meh i'll tolerate once they changed Cleric Stance in Stormblood. I do not care for pure healers at all, they are a blight on healer players and I hope I never run into them, but I still wouldn't tell them to go play something else , I just tell them to dps if snarky response or refusal, Das Silent Big Boy Boot, if passed good ridence, if doesn't, cya party.