On Wikidata, we want to remove the `changetags` right from most users, and only give it to sysops, so that ordinary users cannot add and remove tags on arbitrary edits or log actions. Users should keep the `applychangetags` right, which will allow them to add tags on their own edits and log actions as they are made. Well-written user scripts and gadgets should use the `tags` parameter to the various APIs (T229917), rather than adding tags with `action=tag` separately, which means that the ability to modify tags after the fact is mainly abused for vandalism ([typical example](https://www.wikidata.org/w/index.php?title=Special:Log&logid=666051338)).
Local discussion: [link](https://www.wikidata.org/wiki/Wikidata:Project_chat#Proposed_config_change:_remove_changetags_right_from_users), [permalink](https://www.wikidata.org/w/index.php?oldid=1593102534#Proposed_config_change:_remove_changetags_right_from_users)