best relievers throw 3 innings every game? If you have a veteran catcher, can they catch every game? Do you ride a hot starter an extra inning or two even if it risks his efficacy the rest of the year? The point is that you should be incentivized to treat every game the same to maximize the chances of your team winning as many games as possible. If you have different incentivces in different games, however, then it incentivizes you to deploy your limited resources in a way that maximizes your chances of winning those games, rather than winning the largest number of games possible over the course of the year. It really isn't that complicated.
And there is no logical way to argue that he was the greatest in the history of the sport. You can slice and dice it any way that you want. but we know a lot about baseball, and there is no way to crunch his numbers to even make it close for Rose.
And I just looked at career WAR leaders; Rose is #64 where I looked. Like I said, not even top 50.