When we see dirty planes we wonder whether the things we can’t see are being being handled well. When we see broken planes we wonder whether maintenance we can’t see is being handled well. The connection isn’t always true but reasonable.
One of the odder dirty plane photos I’ve seen on twitter lately is paper towels stuffed into the aircraft ceiling on Delta. Condensation was leaking, and this is the airline’s solution to keep it from dripping on passengers. They didn’t want to take a plane out of service and cancel flights, and it wasn’t a mechanical issue that raised safety concerns. But, as the passenger posting on twitter notes, they also weren’t… changing the paper towels between flights.