I hate to, but I think I put down healing for now. Please make it engaging again, SE.

[Risvertasashi]

I'm not sure where this notion that there is a variety of heal abilities comes from. Most of them are pretty bland OGCD heals that function near-identically to each other. They -are- homogenized. Not enough to be 1-to-1 but enough that you can set up each of their hotbars almost exactly the same and notice every skill has an equivalent across other healers.

I meant more within the healers than across the healers. That said, even across healers there's some variety. Take, for example, fey union. An oGCD regen (most are GCD), with no specific duration but instead that relies on a resource bar. How you build that bar depends on exactly how you can use this very powerful regen, and you yourself choose how long you want it last/how much of that resource you want to spend.

Or white mage. Suppose you need a raid heal. Well if the raid's not moving and gathered, you can use asylum which is nice for being oGCD. If the conditions aren't right for that, you can fall back to good old medica 2 - costly, on GCD, and with a cast time, but somewhat powerful and very good range. If you're on the move, want to conserve MP, or just want to mitigate DPS loss and get a chance to weave - pop Afflatus Rapture instead. But rapture is still on the GCD, so it's not an automatic go-to.

Conversely if you're on scholar you don't have anything like this - you just want a weave opportunity to pop Indom, or maybe use Whispering Dawn instead, but you need to consider timing and cooldowns so you don't end up unable to heal for the next raid hit.

Some of these have duplicates in other kits, some don't, but the point is - you have options when selecting a heal, each with benefits and drawbacks and resources to consider.

This also swings back to why, in a perfect world, I'd rather see heal pressure increased. It is true that healing is so easy even in a lot of high end content that... well, considering these tradeoffs is often a bit moot.