I'd say there's a major flaw here - "the new world of concurrent web backends" - If now was 1995 I might agree with you, but having concurrency in web-app serve

I'd say there's a major flaw here - "the new world of concurrent web backends" - If now was 1995 I might agree with you, but having concurrency in web-app servers is not new. Sadly, concurrency is relatively new and unfamiliar territory to many in the Ruby on Rails community.