I'm bored when I heal because I need more complex DPS rotations

[Avoidy]

You're also bored when you heal because 95% of the relevant content in this game doesn't even require a healer. For healing to be enjoyable across the board, the entire game would have to be revamped to make support roles feel enjoyable. This means making people more dependent on each other in ways that feel meaningful. This means gutting the current "I do my own thing until it's time for the 2 minute moment to kick in" system and replacing it with one where, say, your Mana actually means something and gets supplied by support jobs. Or your attack speed can be lower and you want it to be, and this can be supplied by support jobs. Or the boss can and should be debuffed and this debuff is supplied regularly by support jobs. And on and on and on.

Since we can't even count on people to press Esuna in a timely manner and the game is actively shaping itself to suit those kinds of players, you can kiss this dream goodbye along with any notions of a complex damage rotation.

[Aravell]

This means making people more dependent on each other in ways that feel meaningful.

This is one of the main things that was lost going into ShB. If it were up to me, I'd want tanks to return to their SB level of mitigation. Inter-party reliance is not a bad thing, tanks were not actually as squishy as people remembered back in SB, you could still do the mega pulls with a fantastic healer. But at this point, if any move is made to shift tanks down so they rely more on the healers and their co-tank, some tanks will riot, especially those who are so used to WAR being a one-man army that doesn't have to care one bit about what anyone else in the party is doing.

People often say that relying on other people to do their job is not fun, but having no inter-party reliance is also a bad thing. We don't currently do dungeons with other players, we currently do dungeons adjacent to other players.