First of all: If LB make it or break it in CT you are doing something wrong. Only boss it really matters on is King Behemoth where good LB can prevent the third meteor from landing making up incase the DPS screwed up with killing the mobs. Otherwise most of the bosses eighter have to low HP for it to matter or are simple tank and spank bosses. Yes, I include the bomb boss aswell in that one. Sure, LB can cover up if one group is made of full BRDs and the other is a mix of SMNs and MNKs who are both blind and deaf when people tell them to attack the other bosses when they have like 20% damage left and theirs are on the brink of dying.

Second: This change is not bad at all. It encourages all classes to see play. It might suck in DF, but it is nothing that make or break any Duty Finder available fight.