People will probably hate this, but I'm throwing it out anyway:
One of my issues with healer resource spenders is they're LARGELY the same. I can't speak to AST (since I don't play it), but WHM, SCH, and SGE all have essentially a Medica 1 oGCD and a Cure 2-ish oGCD resource spender. For WHM, these are Rapture and Solace. SCH, Indom and Lustrate (and Excog, but on a longer CD). SGE, Ixo and Duro (and Taruo).
I like the identity of WHM as a GCD healer, which it can leverage (albeit without cast times) through Lilies. By being DPS neutral vs Glare, it means you aren't punished for GCD healing on WHM (and can be rewarded if you're able to line up Misery with burst windows or get useful movement using Lilies). Yet we still get the same two basic effects.
So I was thinking, would something like the regen component of Medica 2 (or a lesser variation of that) be a useful future Lily move? It would be nice to have another option to spend the things on, but Regen is already an instant cast (even without feeding the Blood Lily and thus NOT being DPS neutral). Considering WHM is/was focused on being a HoT healer with big but MP expensive raw heals, it would be neat if it had a resource spender that leaned into that. It's odd when you realize SCH and SGE get more use out of their HoTs (Whispering Dawn/Physis) than WHM does out of theirs, largely because Medica 2 and Regen don't interact with Lilies/their Job resource.
I dunno, just thinking they'll need to add new abilities in the next expansion, and I'd rather not have yet ANOTHER Cure 2 variation. And I'd like to actually get to use HoTs more. Always liked rolling HoTs on my WoW Resto Druid, and having an option for that here would be nice.
EDIT:
Before you say it, yes, Rapture and Solace are not oGCDs. I was more noting they are Job resource spenders like SCH/SGE AF/AG spenders, and being DPS neutral puts them in a similar place in WHM's kit. Point is, I think it would be neat to have some Regen kind of Lily spender.
Note I feel the same for the Barrier healers - it boggles my mind how SCH does NOT have an AF spender oGCD shield. WHM has a more reactive barrier (Benison) than SCH does, which is just silly.