I don't play BLM myself (I dabbled in Endwalker and found it a lot of fun, but my brain is way too smooth) but I don't get these changes. Isn't figuring out how to optimize it in fast fights with a lot of movement the whole point of skill expression for Black Mage? Not to mention, you have a LOT of instant casts, you have better mobility than half the other casters. And honestly, I wouldn't mind tailoring our static's raid strats around BLM. We already default to melee uptime, why not also try for BLM uptime? Why not let BLM pretend to be a melee? Would it be optimal? Hell no. Would it be viable? Probably!