I'm obviously not a big fan of STAS but that show's origin story, complete with the reimagined Brainiac, was really good. One of the neat continuity things was that the music they played when Krypton blew up was the same music they played in "For the Man Who Has Everything" when the dreamworld Krypton also exploded.
Anyway, going back to do a Superman origin story would be like a musician on stage who elected to replay his first song while doing a 1-hour show. Unwillingness to move Superman forward is part of that which holds the character back.
I understand the irony of saying that while not being a Jon fan...