> The biggest headache when coming across these menus on the web is the complete disregard for accessibility.
The blog post says users are conditioned. That's exactly the problem. The author hopes that users would be conditioned to find a site map at the bottom. I have the feeling 15-20 years ago in the ages of pure HTML that was more common. Nowadays 99% of the users don't learn that. It wouldn't be hard or impossible to learn. It's just that marketing driven design for fancy UI has ruined accessibility because those user have no voice.