They ignore a ton of context. Players don't put up the same numbers season after season. They usually struggle for a couple years before figuring out the majors. Have some good seasons in their peak, and decline as they get old. That doesn't account for things like injuries. Mauer's career isn't indicative of his future performance at this point b/c he's in decline. Plouffe's career numbers aren't indicative of his future performance in large part b/c of his struggles when he first came up. Sano's career numbers only indicate potential, and are most definitely not a benchmark that we can use to predict his ML career. I want Sano in the majors too, but right now, there really isn't a spot for him. There's no way he should be replacing Plouffe. Like it or not, Mauer isn't moving back to C, and DH is (rightfully) Vargas' for now and probably Arcia after that, both of whom have stronger cases for the position.