I came across some posts (answers as well as questions) that I had downvoted due to their low quality; however, later the OP updated them, and now they are good ones. But my downvote was still there, and I even forgot that I ever voted for them.
Isn't it better if we get a notification when someone edits the question we voted for so that we can retract or change the vote? It doesn't make sense to keep questions downvoted after improvements.
I find it more relevant with ID questions; when someone new posts the ID questions, they mostly have very little information. Most people don't understand that origin, year of release, etc. are important parameters. Later, when someone explains, the OP improves their questions.