Even taking managers desire for the their toys out of the equation, i don’t think it’s workable. What happens when pitchers #7 and 8 have breakout years and 3 and 4 suck? If one of them them turns into an Andrew Miller type do you want to limit him to pitching every 3-4 games rather than in High leverage? If I’m going extreme experiment I’m going 4 game rotation of 2 pitchers hoping for 3 innings apiece flexing them to 4 if they’re efficient, 3 short relievers, a LOOGY, and a swingman shuttle