My dishwasher has buttons on the top like this, and during the heat dry cycle the steam will activate the buttons and I'll hear lots of random beeps from the kitchen. Ponce in a while it manages to cancel or restart itself, hilariously bad design.

While my dishwasher has the "buttons" at the top of the door, it puts the light on the bottom, so it shines on the floor. Little red dot. Cats like that dot.

My parents have one like this. My dad got it because it blends in with the cabinets. Purely an aesthetic choice. It absolutely sucks to use though because once the cycle is done it beeps extremely loudly until you open the door since it can't just indicate with a light that there are clean dishes ready inside.