Linuxsucks

That is a neat idea. You can implement this change in vim (or the editor of your choice), and open a pull request to contribute it if you wish! Another idea would be for the editor to automatically re-open itself with escalated privileges, maybe caching your changes to a temporary file so that you do not lose anything (could be dangerous if editing sensitive data that shouldn't be written to a temporary location, or if you didn't understand that you were opening a system file that you should be cautious in [but I can think of ways to mitigate that problem, too! Like just notifying the user that the editor needs to escalate the privilege]). I think it is important to realize that none of these solutions are the responsibility of the operating system itself, but instead the programs that you are choosing to use (Notepad/vim)

Modern versions of vim do warn the user up-front when they open a readonly file for editing, which I think is a nice solution, but sure, it doesn't explicitly offer to save the file in your home directory for you. This is still always an option though (:w ~/myfile), and if you don't know how to use your text editor to save a file and need that level of hand-holding, then maybe you shouldn't have sudo access in the first place?