I actually strongly disagree with your example here. It is a perfect reason for bumping a topic.
There are 2 reasons I think bumping is critical.
- Alert others of a solution / progress on a topic.
- Prevent abuse
(2) is only covered partially as you can still edit earlier posts in a topic, and in a high scale forum have it go unnoticed. @howtogeek has discussed this with us in the past.
If anything I think we need even more intelligent bumping of topics, not less.