[lugermorph]

One of the most annoying UI design features to me is multiple ways of doing the same thing on the screen at once.

Windows 10 does this endlessly. You can use the taskbar to get to your files, you can use the Start menu to get to your files, you can use the tiles in the Start menu to get to your files. This actually makes it far more confusing when trying to quickly get to your files. At least on macOS there is one single button to get to your files (the Finder icon).

If you've ever used Maya you'll know it's the same thing. The layout is incredibly overwhelming and when you want to quickly and effortlessly switch to a different tool, you have to think about what button to press. I switched to Cinema4D as their design is simple and very intuitive.

Good UI design to me is about having labeled buttons that have a depth of interaction, rather than putting all the buttons on the same screen at the same time. Obviously you don't need to abstract away menus all the time (like the proliferation of pointless hamburger menus), but at least cleaning up buttons makes UIs more usable.