PS: I also don't think the Avatar-God ending is very open to interpretation. I found it sad under a coating of fun. The narrator tells you how you still care about your friends, but your way of interacting with them is heavily focused on asking them to worship you - and they aren't buying what you are selling. The letter God-Gale gets from Elminster as well as Tara's dialogue are also not very open to interpretation.
Tbh, I went for the evil route in my campaign (I played Gale as a wild magic barbarian, Mystra forgive me), so that comment was spot on. If its the same for every instance, then its not ideal, but still understandable, since godhood takes a toll in terms of emotion and general perception of things. Which seems logical and narratively beautiful, if you think of it. The saddest part is Gale never knew till he tried, and I doubt there is a way back. Gale is a tricky example since there is a radical metamorphosis going on there, same as for an Ascended Astarion.
Also, narrator comments are not interpretation of the events, they are hard truths. We are still free to imagine the character as we see fit: still human at heart or on the contrary - an emotionally distant, godlike being. Maybe I misunderstood Crimsom's idea, but from what I've gathered, he portrayed some scenarios where little is left unexplained. In this route, Wyll's motivations are thus, therefore he is a torturing maniac mad on revenge and keen on making the devils suffer. Not a way to go, at least for me.
