Putting a notice either like this or as an indicator on the submission would go a long way towards reducing (my) frustration with moderation’s title edits.
The problem with that is that there are many such notices and indicators we might put up about many things. If we did all of them, the site would get messier and more annoying and nannyish.
It seems generally better (or at least in keeping with HN's 'DNA') to err on the side of keeping things minimal and trust users to figure them out.
That’s fair. I was thinking something in the realm of a bolded asterisk next to the title. Or something similarly subtle with an explanation in the rules perhaps. Obviously there are users who would meta comment about this each time it happened (as is happening currently), so I can understand the reluctance.