Regarding #5 "Lack of Archives," it seems like most modern sites commit a sin that's nearly as bad: lack of reachable archives. At some point the Web collectively decided that The Blog was the one true format for information delivery, and now everything is presented backwards and you need to click "previous" a hundred million times to see last year's posts.

It's especially maddening when people try to use sites like Tumblr for webcomics and serial fiction.