why are most satanists egocentric edgelords when actual luciferianism would ironically rather christ like in nature just inverted or critically flawed? Hell the antichrist probably thinks he's doing the right thing and would probably come across as christ like to the average person

Lucifer seems more akin to Prometheus than the least charitable hedonistic interpretations of Baal or Moloch. Someone who wants to match the divinity of god through grandiose works yet can't. Someone in opposition to creation itself who seeks to create heaven on earth yet never can. A kind of pure impurity.

The dark gothic aesthetic doesn't match either. He's the morningstar and lightbriger and associated with the sky.