The area behind TVs, set-top boxes, routers and gaming consoles is a dust magnet. Warm electronics plus cables plus still air equals fluffy grey drifts that you rarely see—but your lungs do.
Dust buildup there doesn’t just look bad when you finally move the unit; it can also trap heat around devices, making them run hotter and possibly shortening their life. For people with allergies or asthma, that hidden dust pocket can be a quiet trigger.
Pulling the unit forward carefully once in a while, vacuuming or wiping the back and cable area, and then pushing it back already improves things. You don’t have to do it every week, but ignoring it for years is not ideal either.
It’s one of those “out of sight, out of mind” spots that makes a subtle but real difference to how clean your home actually is.