I don't think it was stupid at all! If your mandible was advanced, then you won't suffer from sleep apnea now or down the line. That's no small win! Talk to people who have it, it makes life beyond miserable. Most of your peers who didn't operate will discover it the hard way, after years or decades of problems they didn't realize were connected. No autopsy ever cites "sleep apnea" as a cause of death, only the complications from it.
I don't get why you had double jaw, though, usually overbites are single jaw problems. Any surgeon can downgraft the maxilla. Did he say what material he would use? It won't ever be good as new and they all have tradeoffs. Still, it's done and it's done routinely. You should also know that bony gaps of up to 3-4mm are expected to heal without grafts. The graft is there primarily for structural reasons. Agree on the chin work, I don't like SG either but when done well typically they're small. FWIW, I don't have any tooth show at rest either pre-op but have a good smile still somehow. If you came out of it without functional problems, then you had a decent outcome. We've seen some really s**tty/scary stuff on here.
That being said, I'll be checking my surgical plan before my surgeon goes in lol. But I have confidence about what the plan should look like and there will be no impaction for me.