Middle relievers are often less talented pitchers who go max effort for 1 inning. Closers have at least one pitch that is plus, but lack stamina. If you make relief pitchers throw every day for one inning, they will not be able to go max effort. If you make them go 2 innings every other day, the same thing will happen. That's 160 IP, which is way too much for a reliever. Anything over 80 IP on a reliever is dangerously close to overuse. Same problem with 3 IP every three days. Plus, middle relievers are notoriously fickle from a performance standpoint, which means that this system will be far more uncertain.