@Sophiedp Ooh, I reported that edit issue when I came across it on a wiki I admin--it may also interest you to know that your own user page's edit dropdown, when you are an admin, will not include move or delete options (even though, like editing, they're directly accessible via URL). (I also wonder if the AbuseFilter issue could be solved with custom CSS but it's probably better if it's a tad automatic...)
Another for the possible-bug pile but may just be a feature request, but I'm putting it in this extra post because I noticed it while playing with the mention dropdown:
Sometimes TOS-violating username suggestions show up in the suggestion dropdown (just recently I saw ableist (which I would classify as "offensive") as well as violent, alongside with direct user harrassment (i.e. for a fake example, let's say it said something like "Citrusellaeditswikis sucks" but like... worse). This is a thing that I'm sure happens from time-to-time (more likely to admins who have made a lot of "enemies" by... doing their job) and isn't always easily caught.
But when it is caught and user accounts disabled (which is true of the single one I checked): Is it possible to anonymous-ize or otherwise rename users in this way, and then globally (somehow) prevent recreation of accounts under names like those with something like TitleBlacklist (name-dropping that one as it's standard issue for all wikis here and I know it has that functionality, though I worry it could require or expose local copies of a blacklist? IDK), or would that not be enough to remove them from suggestion dropdowns, i.e. for mentions here, or for, like, Special:Log?
I think it's incredibly... hmm... "oof" at best that account names like that are able to continue the harm they were created to inflict even after they've been globally disabled.