I have my moments when I'm in the mood to play healer for a little bit they're rare and it's usually either trying to speedrun 80s dungeons or doing a bit of PF hopping with some people from my static. I had joined my current static on healer because that was what they desperately needed back then and it was kind of fun at first but lost its appeal within a few weeks when it left me wondering if that was truly all there is to healers.
And other players make it even worse. Wether it's DF or PF, people are really skilled at dodging aoe heals at all costs, not getting raid buffs/ mitigation and misaligning their own raid buffs.
It makes healer gameplay feel even more messy and disruptive than it already does because all you're doing is pressing 11111 while chasing people with heals to babysit them after they outranged all previous aoe heals yet again. Optimising with randoms is rarely possible so even what little there is usually falls flat.
In contrast, playing dps is always fun. Each has its own appeal. DNC is comfy, NIN is fast-paced, DRG has animation locks to consider, BLM has a lot of room for optimisation. Nothing feels more satisfying than barely getting that one more cast out and almost getting my leg burned off when sliding into a safe zone.
It can be frustrating to have other players constantly bait aoes into my Leylines or have me take positions that require the most movement because they have never played a certain position and are completely unwilling to adjust, but at least there's still a lot left I can optimise all by myself. It can even be fun to play around with the rotation to adjust for that poor position I just got. I fight against bosses and their mechanics while on healer I feel like I have to fight against a bunch of particulary stupid headless chicken deadset on making my life as hard as possible.
The former is a nice challenge, the latter is just plain annoying.
And there is no fluent gameplay to make up for it either.