I wouldn't mind this, (especially during the rare chances I get to use the beautiful DPS caster limit break), but my main concern would be that not all areas have the same ceiling height. They probably would be wary about implementing something like this because if you were in somewhere like a door way or a low ceiling cave, then the cinematic would have to clip through the roof to properly display the image, which would defeat the entire purpose as it would mean staring at the fight through semi-transparent walls at best. Either that or we'd get one of those weird scenarios where it hugs the ceiling without clipping which results in you being able to see nothing of what's going on. The only work around to this would be to implement a full "cutscene" for this that simply displays the enemy(s) getting hit with the LB in a static "cinematic room" which most people would get annoyed with seeing after the first time, as it would be the same each time they used it without the background environment changing.....

Still, if they could find a way to implement it properly, I'd be all for a more cinematic view of LBs, since as is you can only catch a glimpse of them amidst the usual chaos unless you have all the UI and other player effects turned off....