Idea creator would like to know the progress after an idea is promoted to initiative or feature. It's inefficient to do this manually.
You can automatically update the idea status when it is promoted or the status of the promoted record changes. You can learn more here.
Idea creators would like to know if anything about an idea is changed or if it it promoted. Idea reviewers see no issues with this and it would save them time rather than alerting them by email.
While this is important, I'm actually voting for the merged idea as a higher priority.