looks like it's just me and you left on this but yeah the first part of your post is essentialy correct. The part about hitting? No, hitting is way harder, IMO. than learning to pitch at the HS level.
BTW I'm going through this process right now with my 15YO son. A SS that is learning to pitch. In a few appearances he's about as good as anyone on his teams. Of course he pitched some in youth ball but never was considered by me as a real pitcher. Now I'm not so sure. We're working to see where it leads but he's just one example. It ain't all that hard.
One other myth that's out there about pitching I hear and read here all the time is you gotta throw 90's to play D1. I call BS on that. I'm guessing the majority of D1 pitchers are in the mid to high 80's. I just sat with a D1 pitching coach and had this discussion. He went throw all his guys and out of twelve he only mentioned two that were true 90plus guys. he also said his best was a 85-86 righty that was just a pure bulldog.