The changes sound... fine I guess? The part that appeals to me is being able to insert ranged spells into the rotation at arbitrary points to avoid downtime, though I guess that hardly matters if melee downtime isn't a thing in boss design anymore. Moving sheltron to being a damage reduction rather than block is also clearly necessary and good. Not thrilled about the class being yet another standard builder/spender for the exact same burst phase as everyone else but it's retaining the ranged spellcasting, which is the important part IMO.

If I ever return to raiding it'll probably be as PLD.