Level 80s who single target groups of mobs

[Vahlnir]

Why can't we have a reality where its just objective fact that people are ass and make things take an incredibly large amount of time? I'll never know.

There is a portion of the player base (no idea how large or small) that is exactly as you described. But I would still consider it an uncommon occurrence to encounter them in a dungeon/raid/trial/etc. Not rare, but not normal. They seem to come out in droves for Extreme trials and PvP though! But I'm not sure if it's just bad luck or if the universe is trying to tell me something.