My firm opinion on WHM is that it should be a low APM job with very light weaving needs that takes more inspiration from BLM. Both are already linked via lore, and the two should really foil one another more. Staying low APM also keeps it feeling easy to play even if given more unique tools to work with.

I also like the idea of taking inspiration from Aerith in FF7R since she's very similiar to what FF14's WHM is like--a more nature-themed healer could offer a really fresh take on the job that can keep it feeling slower and easy to manage at face value, but offer some complexity in the value of your spell order and staying still for certain casts. I do like its existing lily system as well through and moving that down into early levels to make the focal point of its gameplay I think is essential for the job in the future.