Who in their right minds figured that the best design for a public restroom was to have no horizontal surfaces at all!!
Even in the hospital, there are no shelves at all. No place to lay out your supplies you're going to need. No place to lay your purse (no place to hang it, either). And especially, no place to set the full pouch while you clean up around the stoma and prepare to put everything in a nice little baggie to throw away - except on the edge of the sink (truly a disaster waiting to happen). As for putting down the lid over the seat - there aren't any any more! Just open seats.
It used to be bad when my kids were tiny babies and I was trying to nurse them in the bathroom (back then, you did not do so in public in the restaurant, even with a blanket covering everything). It's gotten progressively more horizontally challenged since then.
I do love baby changing tables, though.