Problem: For a few years, category changes have had dedicated entries in recent changes and watchlist. This is useful for watchlist – when you watch a category and have category changes enabled, you can see recent additions and removals to the category. For recent changes, this isn't much useful as it lists changes to any category. For Special:RecentChangesLinked ("related changes"), it only shows additions to the category. It's because when you remove a page from the category, it is no longer "linked" and thus it isn't listed in the related changes anymore. I believe this isn't logical as this change is pretty much related. Additionally, the diff links of category changes are quite buggy and could be fixed as part of this wish.
Who would benefit: Wiki gnomes checking for mistakes, patrollers checking for vandalism, wikis with complex categorizations
Create a new special page dedicated to category changes (similarly, there is Special:NewPages for pages creations)
More comments: All of these could also add a filter for additions/removals only. Option #3 a stand alone tool to see whats been added or removed from a category in the last 30, 60, 90 days.
This is basically the same as Content changes to categories. This proposal is more well thought out, so I might suggest merging the other one here, with Gnangarra's permission. However my gut tells me Special:RecentChangesLinked is not the correct place for this, the keyword being "Linked". If a page is not in a category, it's no longer linked. So option #3 seems best, which is basically what Gnangarra was proposing. MusikAnimal (WMF) (talk) 17:31, 30 November 2020 (UTC)[reply]
support option #3 as a stand alone tool so that we can view the history of additions and removal of items from categories to better identify when changes are taking place and why Gnangarra (talk) 23:44, 30 November 2020 (UTC)[reply]
While Special:Diff/20730296 would definitely be nice, I will note that categorization changes are currently bound to other recent changes, which for WMF wikis are purged after 30 days. So if this was to be implemented, it would be a lot bigger project. --Matěj Suchánek (talk) 10:01, 1 December 2020 (UTC)[reply]
Support I would have gone further with this and enable a watch mode that adds any page in the category to the watchlist (especially useful for categories of discussion pages), but this idea is gonna be helpful as well. Tomer T (talk) 08:04, 10 December 2020 (UTC)[reply]
Support support this solution. Create a dedicated "mode" for categories in Special:RecentChangesLinked (i.e., make #1 explicit) Leftowiki (talk) 00:37, 9 December 2020 (UTC)