It would definitely add a lot of utility, since you could setup a permanent teleport location for use with Between the Lines. That part I wouldn't mind, as that sort of stuff seems fun.

But it would also introduce even more pressure to always stand in one exact spot, because now optimal play doesn't just mean standing in one spot during Leylines windows, but for the full duration of the fight. Personally, I'm not a fan of that. I'd rather have "phases" of my Black Mage play that are more mobile and phases that are less mobile, rather than a single monolithic "stand right here" phase.