Why do DPS not use Limit Break anymore?

[AC9Breaker]

I don't lb3 bosses until the last 10% in Duty Finder. I've learned from experience that no matter how easy the boss might seem or how smoothly it's going, a group can always somehow fall apart and near-wipe leaving just a healer and one or two others alive. The tiny bit of extra damage rarely makes a difference on non-savage, but a healer lb3 can save a wipe.

^ This right here, so much. Quoting to spread the message.