Even though, as I said, I don't think Incarnate powers were sustainable over the long term, I still love the idea that, even at the endgame, you improve your character by getting new abilities, not like every other game where endgame just means farming to get gear that gives you +10 more HP or +2 more strength than your previous gear did. Incarnate powers were another layer of customization on top of everything else, and expanded your character's breadth instead of just making numbers bigger (except for Alpha and Hybrid, which is why I think the latter was a bit of a misstep).
.... damn, I still miss this game. Are we there yet?