Funny you should ask. I just listened to a podcast with an interview with Swen, and that came up.
https://www.usgamer.net/articles/ax...-on-baldurs-gate-3s-early-access-releaseSkip to 26:15 for the start of Swen's interview, but the pertinent question is at 33:30. Swen claims that the backstory for the custom character has as much depth as that of any Origin character. At 36:00 he says that the "Who do you dream of" character is a pretty important character, key to the custom character.
I've been trying to find any interviews since the EA release but have not found any yet. So this was immediately interesting to me. Unfortunately, it's a podcast, and as such does not come with CC and my hearing disability doesn't allow me to follow what's being said. Is there anything more you (or someone from Larian) could add on what Swen says?
There's not much said and what was said pretty unsatisfying. 1) the "who do you dream about" character will play a big role 2) you will understand why your character is so unique when you play one of the origin characters.
Frankly, I didn't understand what he was saying with point #2.