I think they should add a Swiftcast effect to new Thin Air and make the next cast instant. I'd actually remember to use it with something other than Raise then.

Though the other issue with new Thin Air is with how it doesn't play well with Presence of Mind at all. Would've made a clear burst window had they kept old Thin Air but made it 2 charges and lined up the charge time with Presence of Mind's 120s. Alternatively they could also just reduce MP cost while Presence of Mind's active.

Also regarding Liturgy of the Bell, much like what others have said, I don't like how long its reload is for how short it lasts, but I really don't like how it's largely a delayed heal, which is more AST's thing when WHM's style tends to be more reactive. That's what makes WHM the beginner/prog-friendly healer imo. It'd be way more fun to use if it lasted much longer and had a button to manually use its stacks, not to mention actually making it useful for mob pulls in dungeons.