On the one hand, a main reason that Wikipedia’s articles are as good as they are is that they are edited by experts and other knowledgeable people to whom deference is paid, although voluntarily. On the other hand, some Wikipedia articles suffer precisely because there are so many aggressive people who "guard" articles and drive off others, including people more expert than they are; without granting experts any authority to overrule such people, there is no reason to think that Wikipedia’s articles are on a vector toward continual improvement.
