lets see hitting delete won't delete a file. copy and paste sometimes you can use the mouse sometimes you have to use the keyboard. clicking the x on a app is the same as the minus most of the time so you have to work to close apps. whats the point of the x if most of the time it does not close an app?
First, I'd like to say I am all for everyone having their likes and dislikes about OS-X. What I don't get is when, so often, dislikes come across as if that functionality is missing - when it's simply a matter of either learning a new method or understanding what a function -
that looks familiar - actually is meant to do.
Deleting a file: cmd-delete
Copy/paste: can't think of a situation where both aren't available (and also through the Edit menu). If you can pinpoint when that happens, please post it.
Clicking the 'x': MacOS is much more document based than Windows. When an application's window is modal to that app, it makes sense to close the app (like System Preferences), as there isn't anything else for the app to do. When it isn't, such as TextEdit or Pages, or pretty much any content creation app, closing the window simply means you are finished with that
specific document. The app stays running because you can reopen it, create a new document, or open a recent document (for instance). You'll notice documents seldom have any kind of menu bar, rather they have tools needed for the document (like justify, fonts, etc.).
The single Menu Bar and document based paradigm has always been a major difference between Mac and Windows. I hope I've helped explain the 'x' - this is something brought up often in forums.