Yeah that’s a huge part of it. Few Americans (me included) frequently walk outdoors on anything but sidewalks or paved roads in their normal day to day travels. When I go hiking I take those shoes off before I get back into the car, but my daily driver boat shoes which rarely touch actual dirt? I don’t have a problem leaving those on in most places, my house included. Same I imagine for Americans where their job is construction or something where your shoes are dirtied, talk the work shoes off when you get home, but it’s fine to wear more casual shoes