But what happens if you don't have any relievers that haven't gotten much work lately? What happens when they're all being used, such as 2 weeks ago after the Puerto Rico games? Then they're stuck making changes to the 40-man roster based on immediate necessity, which usually means journeymen. You have the right to disagree, of course, but I do think a mop-up pitcher is a vital role. Don't waste your core reliever arms on meaningless innings. They can get extra work in the bullpen. Anything can happen in a live game (e.g.: injury).