Well, this is a complete backend vision. This guy is not wrong, but if you build something complex that requires smooth transitions or dynamic elements being created at runtime you will end in so many problems and headaches. Separate your UI from your service has some great benefits, like caching, offline navigating and smooth experience, your users don’t want to wait your UI to fully loading to do something, and made things entirely on server is not good (if your server slows down, then your whole UI goes to be slower too) Obviously you can write some js stuff to fix the points that I have quoted, but the maintainability of your code goes from hell. Again, you are not wrong, even if it’s you will do the maintenance and evolution, you cannot guarantee that you will do for the rest of your life. I’m not saying that the people must do overengineered products for a simple purpose, but making a very good, solid and resilient project will bring less problems in your life.

The site name's a play on "The Onion" so it's gotta be satire, right? I couldn't find an about page to confirm.