What really chafes me is MiniUSB. It was superseded by microUSB 12 years ago, but it STILL turns up in brand-new devices. I recently bought an action cam, a dashcam, and a retro input device converter that all had MiniUSB. I only had a single MiniUSB cable for my PS3 controller so I had to go out and buy a bunch of obsolete cables.
Reading threads where the independent maker of the retro converter was defending his choice, "I find MiniUSB is more sturdy". So now everyone buying his thing needs to stock another kind of cable for a device where the socket isn't even going to see much wear and tear. (and MiniUSB being more sturdy is debatable - the socket is designed for much fewer insert/remove cycles).