Ok, the way he said it was dumb, but I think what he was trying to get at here is that relief pitchers tend to pitch above their true talent level because of their limited and specialized roles. I can see the merits of wanting to expose Randy Choate's dumb career.
The argument "well, what about pinch hitters?" has been made. It's not the same thing. Realistically a team would have two, maybe three guys who are worthy of pinch hitting opportunities with a backup catcher and a utility infielder comprising the rest of the bench. But there are 7 or 8 relievers so a manager has a lot of potential to overuse/abuse pitching changes throughout the game.
To me, part of the charm of baseball is being able to manage limited resources in order to win a game. The 7-8 man bullpen is basically a bottomless pit in any game that the starter went at least 6 innings. Instead of a manager managing his bullpen for the next hitter, Manfred might be challenging him to manage for the next three hitters. I don't see anything all that wrong with that but judging the reaction in this thread I guess I'm in the minority on this one.
EDIT: I don't even care about the length of time pitching changes take. I just find it kind of lame that a pitcher comes in just for one batter....then the next pitcher is used in the same way.