@Kabooa
While that does give BRD/MCH a new viable usage case for the Limit Break, it doesn't fill the issue of each LB being unique per class. Right now, you've got the tank "Defences up" LB, the healer "OMG HEALTH UP!" LB, the melee DPS "Super-Burst" LB, the Caster's "AoE Bomb" LB, and the BRD/MCH "Skillshot Bomb" LB. The OP was suggesting that each class has a different LB, as opposed to a different animation per LB. Let's take the SMN and BLM as an example. Here's how we could separate the LBs so they do something different as opposed to just having a different animation.

BLM LB: Keep same as before, same animation, looks nice. This big AoE burst bomb.
SMN LB: Perhaps a powerful DoT, for where you need a steady influx of extra damage.

The SMN LB now ties in a lot nicer to what the class is about (DoTs and debuffs), as well as becoming more unique to BLM LB as opposed to just a different animation.

Now think that, but across the board for all different jobs/classes.