Most of FFXIVs issues is it's a western style MMO going through a JP mindset. 20+ years of experimentation has gone around in western MMOs so now those Devs have a better idea of how to balance roles, WoW for example had very similar healer design to current XIV 15ish years ago however it was unengaging which led to healers quitting so they turned this around to having more damage dealing and now current healing is fun, still has balance issues but there's regular rebalancing.
GW2 also has real fun healers and balancing issues every once a while.

I've played a lot of eastern MMOs and they are not designed with this in mind, everything is role restricted, healers heal, tanks tank and DPS DPS. That is if you even have trinity roles, the JP and Korean game design mindset seems to think that you have to play your role and only your role. I'm pretty sure most JP players wouldn't mind if healers literally weren't allowed to deal damage in raids and only heal. Looking specifically at the FF forums at least, it's sad but early ff14 was not normal design wise for JP MMOs the game just became more and more like all other JP and Korean MMOs.