Pitching a lot of innings doesn’t make you better prepared to go on three days rest. If it did, teams would be asking innings eaters to do it, not their top pitchers. That’s why this example isn’t a great one for the Snell situation. Those pitchers weren’t asked to go extra innings, they were asked to pitch with fewer days rest.
Anyway, this is fun being doubled teamed by father and son. Tap your dad back in, I am sure he has more good points to make