> That said, I don’t think it’s really rational. Our houses are full of bacteria and dirt one way or another anyway.

True, but I don't know about you, but we don't have literal rocks, sediment, dirt pee, or literal poop on our floors in our home, anywhere. But shoes do occasionally step on stuff like that no matter how small, and neither of those things I want inside of my house on the floor.

But you're right that there still is bacteria or dirt all over the place, no doubt. But still, I don't step on something slightly soft with my socks in the living room and then inspect my foot to find poop stuck to it, and I think I'm gonna continue to prefer this way.