Been here since PS3 beta and 2.0 early access, and I assure you, those two aren't the only two things I've heard, just the most ridiculous.
Just because YOU haven't heard it, doesn't mean it ISN'T an issue.
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I like mountains, so I use LB3 w/e its up. :)
Think an issue is how the game doesn't really give you any sort of tips on when there are good times to use it, and the lack of any agreement between the community. Have been berated a few times for doing caster lb on a big trash pool for "wasting it".
Lack of information about LB ingame has let the community create all sorts of weird, nonsensical rules about it. Which wouldn't be so bad except if people paid attention on how it builds up in a particular instance, then looked at the party composition, we'd have less "omg, now we're only gonna have 1 gauge worth of lb at boss" and more people smacking mob packs with it or using it first hand at a boss as melee dps.
Also, I can't agree enough with OP on the statement with healer lb3. That's an excellent safety net IF--(and a big IF there)--people in the alliance or party learned from their mistakes. Otherwise, get ready to have another 6-10 dead people within the next 3-5mins.
I mean, good use of a healer LB3 can feel truly epic when it works out.
Had a run of Rabanastre in roulette the other day which somehow went horribly, horribly wrong. There was a point during Hashmal where we had only three people up: myself (WHM), the tank in my alliance, and the DPS in one of the others. My alliance was not quite to LB3, but someone commented in Alliance that the alliance who still had one DPS up had LB3. Swiftcast was about 6 seconds from cooldown.
Kept the other two up while waiting for Swiftcast, then rezzed a healer in the other alliance. They popped LB3, and the other whole alliance was up. At this point, my alliance's LB3 finished filling, and I popped it to get my alliance up, while the just-rezzed alliance's healers worked to get the healers from the third one back up. Somehow, without discussion, we all worked together to get through it and in the space of about 4 seconds we went from 3 people up to having two full alliances; we recovered and managed to get through the fight without wiping. The fight had started as a disaster, but the sheer "we actually pulled that recovery off?!" of that moment stuck with me through the rest of the run.
(Rest of the run went perfectly smoothly; I genuinely have no idea what went so horrifically wrong during the Hashmal fight.)
All I know is 99% of NIN seem to have LB off their cast bar despite being the best suited to LB.
I have been playing on and off for a very long time, My preferred Class is Black Mage, and I have 3 mains. My Au Ra is geared for Eden Savage. My DPS is right along what the experts with the meters want. If I'm in a Random or a Static, I wait for the party leader to type LB, or say to use it on Discord. In a Random the Tank should be the one to let the DPS know when to use it. Since I'm usually on BLM, it would be a waste of my single target DPS for me to use one on a Single Target aka Boss. However for AOE fights, esp big ones, I can slip it in No problem, but I will only do it if I see in Party Chat: "BLM LB" (note Say & Yell are Muted thanks to Gil sellers spamming those channels. I kind of feel bad for the people who chat in say all the time, thinking I might see it. :( sorry nope.)
All negligible. Optimal use of LB, or lack of it won't make or break a dungeon.
If I taught a limit break 101 course, the most important thing I would teach is for the group to make sure to expend the gauge before getting to the boss. One of the most disheartening things to see is all that gauge that was acquired just get sapped away. This is the biggest mistake players make, and most don't even know they're making it.