> You have to have editors maintaining these pages which (if they are being deleted, generally) are not notable enough to have significant reputable sources devoted to them.

But Wikipedia editors are completely non-fungible. The guy who wrote the page on some obscure 80's movie isn't going to start maintaining the Civil War page with all that extra time if you delete his movie. He's just going to stop editing. So the 'quality control' reasoning doesn't hold water with me. The navigation point still stands, but that's a technology problem that can be solved.