WordPress regularly autosaves completely unchanged blog articles, just because someone left the page open...as I almost always do.
Then, when loading the page to actually edit, we get the annoying...
[There is an autosave of this page that is more recent than the version below. View the autosave.]
Many of us, myself included, get into the habit of ignoring that message, because 90% of the time, it's wrong. We follow it, diff the revisions, and get the message...
[These revisions are identical]
So then we stop checking, after a few dozen times, and we start missing the few that are actually saves we forgot to make.
Speaking as a professional web developer, all that someone at WP need do is take whatever test is being done on that last screen, and do it BEFORE showing the autosave warning.
Just make it a test: Only show the warning if the autosave is actually different.
Just one extra conditional, calling existing code, and then the "you have an autosave" warning becomes useful, again.
The blog I need help with is butnowyouknow.wordpress.com.