Why do they do that?

The latest Lunar has a box-like structure alongside the toilet, for dirty linen, which would just about hold one complete change of clothes. IMO neither useful nor ornamental.

Several vans have rubbish bins on the door, thus preventing you from opening the top half of said door, and deploying the flyscreen.

Magazine "racks" attached to the wall, in the same fabric as the upholstery.

Also seen - spice racks, metal bars for hanging up utensils, and (my worst nightmare) kitchen roll holders.

Seldom seen is a towel rail as well as a towel ring in the shower room.

Why?