<i>&quot;7. Cmd+Down to open the selected file! Why not Enter?!&quot;</i><p>Consistency. Cmd+Up moves you up one level in the file system, Cmd+Down down one level.<p>Also, at least historically, there was a consistency in that a key stroke is a command if and only if it contains the command key.<p>The reason the Finder did not have copy-paste for years, and why it doesn&#x27;t have cut till this day is that it is hard to implement. A proper cut would immediately delete the file from the file system, and a later paste would paste the file with the contents it had when the file was cut or copied (Excel is also notoriously bad at this; cut a range, close the file, and try pasting)