Here's one, slightly car-related: what's with many cars having worse and worse rear visibility?
My usual test for this is usually the last one I do on any test drive: I reverse the car back into its original space at the dealership.
On the F30 320i 4-door I test drove, this proved........to be more mental exercise than I would prefer. Between the slightly-more raked rear windshield and the thicker C-pillar, I really had to prop my body/head up to get a decent view.
On my E90, I do it quite a bit of the time and it's very easy. Ditto for cars like the Golf and Tiguan.
What is this tomfoolery for? To increase space in the boot? Better aerodynamics ?