Here's a concrete one: Enter enters rename mode.

I can make the apologetics for just about anything in macOS. After over 20 years of using OS X/macOS, I still can't make the case for this one. Imagine a button has focus, you hit Enter, and it allows you to change the text on the button instead of executing the code behind button.click(). That behavior is just as dumb if a file has focus in Finder.