today, there is a history of ever little change made to a description in a feature or an idea but I would would argue that understanding changes to a roadmap has more value to users.
Use Case: For some reason the folder and the custom roadmap view that I created with my team was suddenly gone. Both the UHC rep and a support person from AHA were not able to recover it. To this day we don't understand the root cause for the missing data and wish we could get the view back without having to re-create it