In addition to the excellent replies above by Fargoguy, Mike, and Carole above, don’t forget Mauer doesn’t play first base once per series. Which is bad enough in itself, but becomes really limiting when someone else isn’t in the lineup. Give Sano a sore hammy, and now what’s the lineup look like, with Mauer not at first? A part time first baseman who only plays first base WILL have a negative impact on the lineup. And the reward is a .750 OPS if you’re reasonably lucky. Move on. Let’s hope they aim higher.