My colleague friend and I just encountered an inconvience that was due to the project_installer module not being enabled after updating the Drupal 7 database to Backdrop.

We strongly feel there should be some sort of post-update summary that lists modules that Backdrop CMS both supports and enables by default that were non-existent in Drupal 7. This sumnmary could include an enable button or a link to enable the particular module(s).

Cheers!

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/5606
GitHub Issue #: 
5606