I love the idea going so wild and crazy with Jon's upbringing, and then ironically grounding more when he's finally nearing full manhood. It's like going from Silver Age Superboy to college years Spider-Man.
There's something really, really charming and alien about Jon's "final frontier" being normal stuff like navigating a college party, or settling on a major. And all the while he's got more power and agency than anyone else in his family have ever had.
So conceptually it ties all the weirdness together in service of a greater idea. And in that spirit I no longer *really* need to see his years on Earth-3 or with Jor-El, but if it somehow played into a present day story I'd be down.
The Legion stuff and how impactful it was on him is something I'm more interested in because now we'd get more of his singular POV on it, so I'm glad Taylor will be exploring some of that in the book via his relationship with Saturn Girl.