It’s not just this sort of editor who cause problems. There is a class of editor who makes no significant extra content via research or substantially flesh out

It’s not just this sort of editor who cause problems. There is a class of editor who makes no significant extra content via research or substantially flesh out article but who watch the edits as they come through. As an example, see the user WWGB - if you review their contribution history you will not see any work done other than “review” the work of others: https://en.wikipedia.org/wiki/Special:Contributions/WWGB https://en.wikipedia.org/wiki/Special:Contributions/WWGB