Which makes it a regularly deployable attack how? You still have to charge it up. It's not really viable to just sit there spamming them up from an empty bar, and if you do that, you're making the game even more sluggish for yourself.
You don't need to charge it. Once your health is in the yellow you can use a limit break whenever you want. If the option isn't there you can just refresh the command menu to re-roll the RNG until it becomes available. It's possible to get multiple turns in a row that let you use your limit.