LB is a very poor system. At least for DPS ones, I've never found it particularly fun pressing a button and picking my nose for 10 seconds while an animation I've seen a thousand times plays for over9000 damage. There is nothing engaging or interactive about this. If anything, it feels bad to have your rotation all wonky because of that atrocious animation lock. When LB damage does matter, I will press this button reluctantly and just feel bad about it. When it doesn't, I simply don't bother most of the time. Amusingly, out of all three DPS LBs I find ranged LB the most interesting one since it at least provides some consideration if you want to hit multiple targets with awkward positioning. And that's still pretty shallow.

LB generation is a highly obfuscated system with exceptions to exceptions and very shallow interactivity especially for the DPS player themselves. And the few ways of actively generating LB involve doing things that are highly counterintuitive - i.e. intentionally eating mechanics or removing and re-equiping your gear before the pull.

Tank LB feels like a pointless gimmick most of the time with SE remembering a couple of times per expansion to put in a forced tank LB mechanic like they do with Esuna or Interrupts. Such fun. And of course the one and only healer LB. The universal - "we get to not learn one mechanic per encounter" - tool. The one LB that actually does something mildly different and unique (except for LB1 and LB2 versions, lol). But is it really enough to carry the entire system and justify not replacing it with a single use duty action with the same effect? I'm honestly not sure.