Explicit feedback to the submitter that a submission title (or URL) is being modified (e.g., URL canonicalisation, denumeralisation, de-howification) might help ameliorate this issue.
It's bad enough trying to proof my own comments what with being navigated away from that comment (I've a few recent typos caught well outside edit windows which nag on me as I type). Changing submitter's content without notice is ... less than optimal.
I'll note that certain edit features (e.g., year edits) do involve a confirmation, which has in fact proved useful.