Jason Torchinsky could use one:

For example, I'll sometimes drive off in an unfamiliar car, and a minute or so into my trip realize I need to defrost/defog the rear window. So I can, you know, see. This particular act is almost always confounding — the rear window defogger/defroster is by far the most randomly placed control in all of motordom. Sometimes it's snuggled up with the HVAC controls, all indistinguishable from the windshield defogger, with its magic rising snakes icon. Sometimes it's over on the left, near where the mirror controls sometimes are, sometimes it's stuck on the center console, and I've even owned a car where it was an unmarked switch under the dash. Nobody has any idea where to put the damn thing. From what I can tell, where they end up placing it seems to be dictated by wherever the guy who realized they forgot it slapped it on.

This isn't the end of the world, but it's a pain. And, potentially dangerous, since it directly affects the driver's ability to see around themselves. It's also unnecessary — this is a feature that has been on cars since the late '60s. You'd think 50 years or so would be plenty of time to have everyone agree where to stick it.

He goes on to complain that touchscreen dashboards and navigational devices are even worse.