Drupal 9 adoption is hampered by the fact that so many Drupal 8 contributed projects do not have a required single-line change to their info.yml files to allow compatibility.
Many projects have existing Drupal 9 compatibility patches available, thanks to individuals writing patches and the D9 Readiness bots auto-generating patches. However, due to an order of operations limitation, it is not possible to (easily) use Composer Patches to apply the necessary changes before Composer looks for compatible releases, therefore many modules cannot be used on Drupal 9.
Have a community initiative whereby one of the following happens:
As for releases, I would suggest the following process:
Postponed: needs info
Proposed Plan
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Shall we close this now?
#47 pointed out there are two threads in this issue. The first one is for Drupal 9 and thus outdated. I like to think that that discussion could have lead to the formation of the Project Update Working Group project. The second was was dealt with in another issue, as stated in #48.