Push and pull doesn't quite get it

Seth's Blog has a post on push and pull which seems to ignore the fact that you can create feeds from wikis, for example notify me on the Information Fluency wiki. I'm not saying the concept works well, at least from my limited experience (I wasn't terribly impressed by the feed we created from the Library Instruction wiki: spam galore), but it does seem unfair to say that wikis do not allow you to push information. Maybe they don't push information well, but that's another story.

I'm not sure how push would be handled on an Intranet where you may likely need authorization to read content, but wouldn't that be the same issue with blogs?