Notepad needs only one new feature: multiple ctrl-Z steps. The last time I used it (Windows 10), undo only did one step, which was plain useless. Add that and it becomes a safe text editor (mistakes happen, you need to roll them back).
But I don't oppose adding new features like this to Notepad, like opening new files in tabs, or even identation suport. Ubuntu's Notepad is very useful because of them, but can't replace more powerful editors, which is fine. The Windows Notepad has always been an MVP of a text editor, ever since ancient times.