The forum index page at /forum should be converted form a table to a list. The current table mark-up treats containers, forums, and subforums as table rows. Since all of them are structurally the same in the HTML mark-up, flexibility for themers is limited. A nested list structure would provide more flexible mark-up for themers. Semantically it also correctly defines the relationships between containers, forums, and sub-forums.
I am prepared to submit a patch for this.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Forum is approved for removal. See #1898812: [policy] Deprecate forum module for removal in Drupal 11 →
This is now Postponed. The status is set according to two policies. The Remove a core extension and move it to a contributed project → and the Extensions approved for removal → policies.
It will be moved to the contributed extension → once the Drupal 11 branch is open.