I can honestly say you are extremely ignorant and really have not done ANY world bosses. You probably don’t even know the spawn timers. You probably don’t even know how the cube drops work.
Ella constantly moves.
Dullahan is ghost type and warlocks/wizards are usually top dps there because it’s weak to magic.
Cerb dies so fast that it doesn’t matter how strong you are, it depends on how lucky you are and how close it spawned to you.
Mineloader same as Cerb.
Crab same as Cerb.
Necro is ghost type.
Basically, it really doesn’t matter how good your “dps” is. When everyone is 230+, it all depends on how lucky you are and how fast you got to the boss before everyone else. Now, if you’re a tank class or a healer and expect to be top dps on a boss, then you should stop playing the game.