I think every forum post should have that tiny text at the end of the post showing the last edit date like every other forum does.It would be easier for -especially new- people to find their way in posts like this.
We're not wasting emails on petty things like these
Forum PMs are emails?
in most cases sending a PM will automatically attempt to send an email if the user has that feature turned on.
We've had serious issues with people that didn't log for years subscribing to flood, ship sales or even general discussion forums.