I had neighbours – 100% Aussie urban background- who liked to leave their shoes outside their unit door, probably for the rest of us to enjoy the sight they themselves could not stand. Otherwise they would have taken those shoes inside their unit. My objections are the sight and the hygiene of it (what next, dirty washing? rubbish on the way to the outside bins?) and the general fact that if these people should use common property for their own benefit (keeping their dirty shoes away from their presumably pristine unit? why else would you store shoes outside?), how about the rest of the residents? Should we store some of our personal items on the landing as well?
A resident used to spray the shoes with water to discourage the practice.