Turning Harpe into Communio is objectively bad if you want to delay ending Enshroud to line up with your next Enshroud and have a ranged attack option. And Communio ends Enshroud early.

Harpe/Whorl/SoD are amazing for this reason.

I do agree Arcane Circle should become Harvest. That would free up a slot.

Delaying Shroud is especially useful if you are doing the UUNGA BUUNGA 4x Shroud burst.