Me too, same reason. But if its a very dry day, sometimes I relent. I do usually ask tradespeople to remove shoes, as they sometimes have boots, and the good ones have plastic wrapovers they put on. They have a pair in their pockets, and put them on without being asked. If a guest said they had issues, such as has been mentioned, then I would tell them to keep shoes on, and ask them to stay in the kitchen (only joking!).