Beds and sofas are where you relax. Shoes are what meet the outside world—dust, street grime, oil, spit, who knows what. When those soles end up on soft fabrics, all that gets transferred bit by bit.
A simple household rule—no shoes on beds or upholstered sofas—protects your textiles from stains, dark marks and smells. Sheets stay fresher, sofa arms don’t get shiny and black at the edges, and you don’t have to deep clean as often.
It’s also a small mental boundary between “outside” and “inside.” Even if you don’t have a full no-shoes-indoors policy, keeping shoes off soft surfaces is a good middle ground that most guests will understand if you state it nicely.