The LoS complaint is getting old. For those of you who haven't figured out how it works, XIV queues "actions" because multiple actions can not be resolved on a target simultaneously. What this means is that if you, as a healer, have two DPS focusing you and throwing out attacks, if they "queue" their attacks and you run behind a wall, you will get hit behind the wall while the queue of actions empties; only after this happens will you be able to cast without interruption. With a fair amount of practice on any class, you can preemptively cut off the time allotted to enemies for queuing more actions against you. The absolute best healers (and anyone really) can break LoS at certain times, empty the queue, and use that window to do whatever they please.
It's not easy, but it's not in the least bit unfair. I'd go so far as to argue that if it didn't work that way, many lesser healers and casters would be boosted to the current level of best healers and casters, and the current best healers and casters would become nearly unkillable.
tl;dr deal with it/learn2play
