At DrupalCon Portland, Dries proposed a new initiative to move approximately 20% of core's current modules to contrib by Drupal 11. Some of these are already being worked on for Drupal 10 in #3118154: [meta] Deprecate dependencies, libraries, modules, and themes that will be removed from Drupal 10 core by 9.4.0-beta1 → . Others might not happen in time for Drupal 10 and can be deprecated in Drupal 10 and removed from Drupal 11.
In that keynote, Dries proposed the following evaluation criteria for evaluating which modules would be best suited for moving out of core:
Modules that have more No's than Yes's to the above questions are good candidates for moving out of core.
Go to the Core Ideas issue queue → to find discussions regarding removing modules from core.
Number of modules:
Drupal 9.4.0 - 84
Drupal 10.0.0 - 75
Drupal 11.0.0 - 68, this does not include the 4 additions. They are announcements_feed, navigation, phpass, and sdc.
Drupal 12.0.0 - ??. There are ongoing discussions in the core ideas queue. It is very likely that Migrate Drupal and Migrate Drupal UI will be removed from core.
That is a total of 16 modules removed, or 19%.
Then, we can use this issue to gather feedback with which to refine that evaluation.
None.
Fixed
Proposed Plan
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
The discussion for removing modules takes place in the Core Ideas issue queue → . AFAIK, that has happened for all the removed modules.
The extensions removed can be found at Deprecated and obsolete extensions → .
I think this plan can be closed, since it was executed as outlined. To avoid confusion, future evaluations and planning should go in new issues.