There is an interesting answer as a Comment on one of the Answers to Is there a way to edit a question without bumping it to the front page? over at Meta StackOverflow which is from @JeffAttwood who says:
there is zero way to do this that doesn't involve hidden abuse and
sweeping changes under the rug. The answer is right in front of you:
The answer to What can cause a question to be bumped? on the Meta site explains all the ways a question can be bumped.
In my opinion, there are circumstances where an accepted answer may not be the best answer. If a question is bumped years later, someone may have a better solution. The asker has the option of accepting that answer instead.
Is there a way ...
As pointed by Mapperz, Shog's answer on:
Is there a way to edit a question without bumping it to the front page?
says there is no way to edit without bumping the question (despite he says also that not all edits go to the front page).
If you search on MSO by [editing] bumping is:question one will see a lot of interesting threads tagged as feature-...
A key difference between a focussed Q&A site like GIS SE, and a discussion forum or other styles of Q&A sites is that old questions with answers are considered just as valuable as new ones. This is because our Q&As are more like wiki pages where the content can be constantly improved.
Improvement to Q&As can happen for many reasons like: