This is part 2 of a two-part suggestion. Part 1 is here.
Many borderline or bad suggested edits are still getting approved. At the moment, there is no good way to educate users who make bad reviews. Reviewers and editors are never notified if their decisions are disputed, or when an approved edit gets rolled back.
To improve this, we should notify all reviewers who voted to approve, and the editor themselves, of a rejection as if it were a comment. No further action or punishment would follow; just the information.
Also, if a rejector takes the time to write a custom rejection message, the editor and any "approve" voters could be notified of that message even if the edit ended up being approved.
That would give the custom reject message actual meaning. Knowing that it will reach other users even if the edit gets approved, it encourages users to take the time to write a good custom message, maybe even provide some links. At the moment,
it is unclear whether the message will ever reach the addressee
taking the time to write a custom reject message often enough ends you up with the edit getting approved under your feet.