Guess I'm not the only one who does that. Unless there's a specific reason to use it (like Titan's heart) I'll sit on the LB until I'm sure it will kill or almost kill the target. If a wipe is imminent and the target isn't near death it's a lot more conducive for the healers or even the tanks to cast it if able, but there's always that one guy who insists one of the melee use it. The DD Limit Break is really lacking as an "oh shit" button compared to the tank and healer versions that can literally save a wipe. It's more of a "Hey, let's shave a few seconds off a boss that's already about to die" type deal. Which is perfectly fine, but it can get irritating having people demand that you LB in a situation where it wont help at all. I can't begin to count how many times I've used Final Heaven at high health at the behest of the party and the immediately run into a situation where the healer L3 would have been much more useful.