I care if Rosario is the starting CF when Buxton would be a much better defender there (hypothetically). You and I agree, I assume, that it doesn't matter who plays where from the offensive side of things. The 9 best offensive players = the best offense, obviously. But this talk of "his bat plays better in LF" is just nonsense. There's no requirement that certain defensive positions produce at certain offensive levels, other than the "that's how it's always been done" requirement.