Alex normal is easy enough, especially with the typical gear most people have at this point, that you're not likely to find any DPS consciously saving the LB3 for a healer in case they wipe.

Sure, wipes and near wipes still happen sometimes in A4 normal when DPS don't get adds, or a green tank eats Discoid without CDs, or a new healer can't keep up with nisi. Even most PUGs, though, can pretty reliably beat any part of Alex normal without wipes.

On the bright side, at least healers do sometimes get to save the day with LB3.

"Oh no, we're gonna wipe!"
*Tank LB3*
"Just wipe it"
"WTF dude just die already"
*Tank pops all self-heals*
"srsly...?"
Tank: QQ