I'm somewhat amazed but mostly amused that the Vim developers care so little about user experience that they continue to ignore that people have trouble with exiting their tool and refuse to adapt to a more expected convention for exiting it.
For gvim, the X works as expected but what would be a more expected convention from exiting a cl text editor be? Most long running cli tools people are used to are read only and have just a few keys for different views and they tend to use 'q' or 'Esc', any single key isn't an option for a text editor. If they're in normal mode, Ctrl-c does give the message "Type :quit to exit Vim" but I'm guessing most people don't notice it or think the ':' isn't part of the what they have to type because they don't now commands start with it, I would change it to "Type ':q' to exit Vim". But people tend to accidentally leave normal mode by trying to type other things, so the Ctrl-C message isn't always helpful.