Lupe: The Eldar at their peak, not the craftworlders.
Also, your first point is about the quality of eldar psykers, not their technology. Also, the webway allows time travel, as does the warp, both of which the eldar empire had much greater control of than the current eldar.
The Eldar emprie did not need to awaken avatars, because they could summon fully fledged gods to fight for them, alongside armie sof deathless robot soldiers to fight their wars for them.
The eldar at their height did not need to create metal bodies for themselves to stave off death; they were immortal and could reincarnate freely. Their immortality made the necrons' immortality look rather lacklustre.
Also, the eldar empire had, according to path of the renegade