Well the OT role is entirely the reason you'd have BFB. It would give Paladins and Dark Knights a small boost in Burst DPS when they're able to DPS safely without being mauled, just to give them that small nudge towards Warriors who are currently the defacto OT of choice in pretty much every situation. It's only a wipe waiting to happen if the tank is bad and presses it at the wrong time, and I don't think you can restrict a skill from a class based on that.