Because the people who think it is are often not experienced enough to realize when they can get away with it. They’ve never actually tried to push themselves to get to that point. They don’t math out how much one healing spell is worth and then use that to get a barometer on how much the rest of their entire kit heals. They don’t press cooldowns in a proactive attempt to solve problems before they happen. They don’t recognize when a mistake another player makes is small enough to not need to be fixed immediately or how to juggle their resources to maximize their ABCs on Glare spam. They don’t let players drop comfortably low enough so that they avoid wasting the potential crit on their heals.
That’s because this game doesn’t ask them to. They press one heal every 15 seconds and wait around if people outgear and know the fight. And as such they’re unprepared to actually do their jobs when it’s finally asked of them properly, regardless of whether it’s DPS or healing. And when they venture into content with appropriate challenge (Extreme trials) they are completely unprepared to do what is asked of them. Cause they haven’t been practicing as much as they should be elsewhere.
Healing is all about resource efficiency, the casual content we all choose to do is already tuned for the most basic and inefficient play patterns, and instead of using that familiarity and safety with casual fights to improve at XIV’s overall combat, they ask for WoW levels of healing when statistically speaking SE knows damned well they do not actually want that in practice. As such, the vets who do try to improve ask both for DPS options and healing kits to be made in a way that rewards synergy with the understanding they are strictly a bonus, not a requirement, in said casual content. And those same people are who get shot down as this same conversation loop happens over and over.
The new guys need a tutorial and to attempt extremes at endwalker’s endgame for at least a tier before complaining about content. They are already being catered to. The vets whether they want more healing or DPS already understand SE’s stance on keeping things simple for the new guys. They’re asking for more depth within the current framework. In an ideal world fights would slow down a bit, trim off their peaks slightly, amp up their sustained damage sources, and still ask healers to DPS sometimes, just with a few extra buttons and probably some Assize/TBN like bonuses that let them do both.