I'm still kinda annoyed that most people - Swen included in his demonstration - say that the 'solution' is to walk over to the lever that bypasses and auto-solves the puzzle for you and pull it. I hate that, personally.
Niara you are absolutely right. Maybe this alternative approach takes revenge and falls back on the player? It could be that characters who have the Sage background, for example, are not granted the XP / inspiration for it: THE PHASES UNFOLD - Solve the moon puzzle that seals the door to the Underdark....
I myself have not been so far in the game, but would advocate that the XP / inspiration should be granted only with direct solution path.