Why is 4:3 aspect ratio still used?

I don’t know if there is a real answer to this or if it’s going to be a rhetorical question, but why do most or all of the point & shoot cameras use a 4:3 AR image sensor? I know some cameras have options to change this to 3:2 or 16:9 for the photos,but I doubt most P&S users know this.

If they have their photos printed, most stores print 4”x6” which is 3:2. The customer may wonder why heads are cropped off the top of the pictures.

If the digital photos are viewed on a PC monitor or TV most of these displays have been 16:9 AR for several years.

Camera manufacturers always want to have the latest & greatest product, so why do they keep making 4:3 image sensors?