So, uh, remind me again what happens when I go around corners?

You finish the corner and go back to driving straight, which is how the vast, vast majority of your driving miles are covered.

Mismatched tire diameters significantly increase wear on your differential(s). If you have a limited-slip system of any kind, you're likely to destroy it shockingly quickly.

If you're driving half a mile to work through residential and business districts, it's not that big of a deal. If your commuting on the freeway, you're going to significantly increase wear.