Why couldn't he be a full time starter in your scenario in the majors? He would be a full time starter by year 4.
His limit was 50-60 with never being a full time starter college and only 13 innings in the COVID year with an injury.
If your point is that you only wanted to see him in the majors as a starter and wanted gim to work as a reliever and part time starter in the majors that's fine. He would be in the majors in 2 more years or so.
But he would would have followed the exact same innings and plan either way.
So what is of more benefit to the White Sox and his development? Following that plan while helping the White Sox win now or having him as a fulltime starter in 2024 and no help now?