Why we need more than one review to accept an edit?

As you all know, once a user reach 2000 reputation he is able to edit questions and answers. Users with less than 2000 reputation can also edit a post however their edit needs to be reviewed and accepted.

Every now and then I see such edits and in most cases I accept these edits. What's odd is that we need more than one user to review and accept an edit. Not too long ago I got this message after accepting an edit:

"You have already reviewed this item. It needs more reviews from other users to be completed."

I find this odd because as a user with more than 2000 reputation I could edit the question myself without the need of peer-review, so I don't see why I can't accept an edit only by myself. What's more annoying is that once I approve an edit I can't edit the question even further (I have to wait for the previous edit to be accepted/rejected first).

Is there any reason for this?

• I think the point is that any user with 2000 reputation would also be able to reject somebody else's edit—even though at 1999 they couldn't even make an edit without needing approval. see my answer below! – timtfj Jan 27 at 15:29
• From what I read in the list of feature changes, the change from one to two reviewers was made in October 2012 (2012-10-16). See also: It takes two to tango? You can find there also link to an older discussion which preceded this decision. – Martin Sleziak Jan 27 at 19:38
• Because some reviewers, yes, even those with greater than 2000 K in rep, review on autopilot, or are careless otherwise, occasionally. Always good to have an extra check/extra reviewer, so when the two disagree, a third can weigh in. – jordan_glen Jan 28 at 15:59
• @timtfj I see, thanks for your answer too. Your situation explains why we need two to reject an edit. Still I don't see why we need two to accept it, and why can't we edit it further before the edit is accepted. – Yanko Jan 29 at 18:53
• @jordan_glen I see. I wonder why one accepts an edit if he doesn't read it. Anyway I still don't understand why we can't edit it before it is accepted. – Yanko Jan 29 at 18:55
• @Yanko I was thinking the same. An accepted edit gets seen afterwards anyway, so people can undo it if they don't like it, but a rejected edit is invisible and (presumably) nobody can un-reject it. So accepting and rejecting aren't quite equivalent privileges, I'd have thought. (I've not quite acquired them yet, so I'm not familiar with the reviewr's side of the setup.) – timtfj Jan 29 at 20:06

I was surprised by the second reviewer's rejection (the edit seemed completely essential), so clicked to see their stats—which said they'd rejected over twice as many edits ($$>1700$$) as they'd accepted ($$<700)$$.