Some pitchers are built for the rigors and some aren't.
Gooden, Clemens, Felix, Seaver, etc.
These guys came as 19-20 year olds and doubled their lifetime-high IP and went on to have 20 year careers. You never know if you have a physical specimen like that unless you put the workload on them. Having a hard line stance like the Verducci effect is IMO pretty dumb. Wood had terrible mechanics and only had a healthy season as a SP like twice. Steele is friggin 28. Baby stepping with a dude that age is pretty absurd to me.