I think there are some IRCv3 extensions in the works for that, but imho it will make it even more confusing since not everyone will be seeing the same thing (at least for the edits), but I guess we'll see how widespread the adoption of those extensions will be.

And even with only partial support the delete function (if it's not limited to the user itself) gives way too much power to the ops/moderator (power corrupts. Absolute power corrupts absolutely.).