Healer LB= situational ( Pf/Df)
Tank LB= very situational
( probably only ultima hm ? )
Dps LB= most of the time

I also witness a lot of LB hesitation in 4 man parties too.
It always ends up to me having to bark out " use lb "_____" please"
Cuz usually 8/10 times, the fight will end without the lb being used.
Then i go like wtf lol, u should have used it because it could have shorten the fight = less healing i'd have to squeeze out.