A recent change to discourse removed the bump when editing the last (or first post) in a thread.
This was a feature we had come to rely on and there is no viable method of imitating this for non staff ranked members.
We benefitted from this functionality primarily to bump posts that were announcement style posts or posts that intentionally received no / few replies.
These were genuine updates to a topic where an edit was removing now obsolete information. The post rising back to the top of the latest feed was very desirable as it informed all members that there had been a change.
Yes, this could be imitated to a degree with a chain of replies, but over time, this will become cumbersome for the user to gather what was being communicated (imagine 10 replies with changes, for example). It was much cleaner to edit the original post / most recent post and have the topic rise up the latest feed.
I appreciate that there will be people on both sides of this, but this was a long standing precedent in Discourse for many years, and adding an option to restore the previous functionality to Discourse will please everyone. Perhaps the optionality can be expanded over time to finely control what activity on a post constitutes it rising up the latest feed.
A link to the bug thread where this change was discussed is below: