I am currently living on the top floor of a three floor house. I don't take my shoes off until I reach the lobby area of my living space. Once my shoes are off they stay off for the rest of the day and I don't particularly like having my shoes on while inside. I have several pairs of slippers for if my feet get cold.
All that being said, I don't see what the fuss is about the floor getting dirty. I clean my floor roughly weekly so it doesn't get visibly dirty and don't think about the state of it between then unless I have been doing something like sawing wood. Feet are designed to step on things and immune systems are designed to encounter and deal with germs (and are strengthened by doing so). What is the big deal about the floor not being clean and sterilised at all times?
All that being said, I don't see what the fuss is about the floor getting dirty. I clean my floor roughly weekly so it doesn't get visibly dirty and don't think about the state of it between then unless I have been doing something like sawing wood. Feet are designed to step on things and immune systems are designed to encounter and deal with germs (and are strengthened by doing so). What is the big deal about the floor not being clean and sterilised at all times?