Could Black Mages Be Improved...

[zuzu-bq]

That would not only not increase BLM's dps but also make AF timings harder to handle post F1 cast since you're refreshing it a few seconds earlier. Also, B1 is useless in most cases so I don't see how that would help.

Well, that’s the point. Black mages suffer too much from having to move.

BLM suffers from having to move if they don't know how to move. If you see good Black Mages playing you can note they move the bare minimum if even move at all without using an instant spell and even then they still don't do enough damage as a job. You can check any other of the BLM threads about this.