I think it’s generally a bad idea to eliminate a potentially useful feature because some people might abuse it.

It seems to me that far and away the better choice is to leave the feature in place along with some way to deal with those who do abuse it if and when they do.

And conveniently enough, deletion and bans - both of which are already within an instance owner’s power - are ways to deal with, respectively, threads that have been maliciously edited and those who edit them.