This could be for every character in the game for that matter. Bosses really only last like 10minutes either way. Players with low reaction time or slow classes unintentionally get in the way of those who are faster.

I know this gets suggested a bunch but it really needs to be brought up a lot because it makes sense.

There is only one reason why I die while fighting with world boss: collision with other invisible player.

Too big area and too fast attacks of empowered bosses as well, but it's a pity to mention it again, PA don't care.
I saw in codex that they add to game bundle (same as vell) for each empowered bosses so maybe they see the problem.