You mean literally Windows' Notepad? Because that's about the worst app to write on. Not even going to go into how it's almost devoid of useful commands.

Make one mistake, you're good. Make two, tough luck, you can only undo once. Accidentally select some (or all) text and type over it then somewhere else? Today's really not your day. It's actually worse than textboxes in this respect.

This happened to me more times than I'd like to admit before I knew better.