Per your request at https://en.wikipedia.org/wiki/Special:Diff/1097046751
Admin tools are not really a "safer" place to start. Yes, less users are directly impacted, but those users have themselves a much greater impact. If admins accidentally delete the wrong page, or fail to delete a page, that's going to be disruptive.
I agree Special:Preferences is important and Special:MobileDiff is a nightmare that needs to end ASAP. (and AFAIK that's planned)
Editnotices wouldn't have been a super pressing issue, but it's been five years since this "temporary" measure and the market share for mobile has only grown since then.
Whatever resources are currently being poured into DiscussionTools should be reassigned, fix only breaking bugs and security issues as it's becoming quite clear to me that it's going to be replaced.