"macOS Finder": you are talking about that software that rename folders when you press the enter key? :p
The Windows Explorer uses Alt+Enter to show the properties of something, and in games and other apps that shortcut means Full Screen.
Also, why does Alt+F4 quit an app? What does F4 stand for? Compared to Cmd+Q to Quit or Cmd+W to close it's a lot less intuitive.
And so on and so forth.
Alt-F4 makes little sense, true, but in almost all windows apps control-q or control-w does exactly the same thing as on osx.
Also, having sane defaults for keys people are likely to press is much more important than /not/ having obscure keyboard shortcuts that users never have to know even exist.
Launching processes with a single keypress and no confirmation can hardly be called "the least destructive action."
In particular, if you have unsaved data, most apps will prompt to save on Alt+F4.
However, Alt+F4 translating to WM_CLOSE is also handled by the app message loop - i.e. Windows sends WM_KEYDOWN events for those keys, and when they get to the event loop, it's supposed to call TranslateMessage. That one normally handles WM_KEYDOWN -> WM_CHAR translation, but it will also handle any shortcuts, and this includes Alt+F4. So if the app is hanging, messages aren't pumped, and the shortcut doesn't work. To send WM_CLOSE, you'd need to use the close button on the window.
So if the app does close on Alt+F4, it was, at the minimum, pumping messages and invoking TranslateMessage on them.
As for Cmd+Q and Cmd+W, those might be somewhat more intuitive, but only for some languages, and arguably only very vaguely intuitive for Cmd+W even for english speaking people.
But then again, I don't think there is a real notable difference in the end between most modern systems. It's more of a question of what we are used to.
(As a sidenote, you can drag documents from the finder into a Terminal window and their absolute paths appear at the cursor position).
Because "Enter" has been used a key to activate/open the currently selected item in various UIs across various platforms for several decades now?
Also, possibly, because the button is labeled "Enter"? I guess on Macs it's "Return" though, but that doesn't really make any more sense.
Lol. 10/10 troll.