I agree with you, he’s kind of a blank slate.
I think that works for a video game though.
It’s also refreshingly NOT the chosen one or blood line thing that’s a bit overdone in Star Wars.
(Crossing my fingers he’s not secretly a long lost Skywalker, Palpatine or Kenobi relative)
Many stories introduce the protagonist in their prime, or when they’re at their most interesting, then eventually release an origin story.
The first game felt like an origin story for a dude I didn’t know. (Haven’t played the second game yet)
My guess (hope) is he’ll feel more interesting as he gets more exposure and character development as games come out and we kinda get to see him grow as we play.