Toilet seats with soft-close hinges, and shower shelving.
The detail that decides a seat
Whether the hinge is top-fix or bottom-fix, and whether its bolts are stainless. A seized plated bolt in the damp recess under a pan turns a ten-minute change into an hour with a cutting tool, and it is the failure people actually meet.
And a shelf
How it holds on, and the surface the maker states it holds on to. Adhesive on smooth tile after a full cure is reliable; adhesive on textured stone is not, whatever the load figure says.