Great talk! This really is the topic I'm interested in learning more about.
I am still missing that one example that will break my understanding of the approach as overengineering. Even though I do believe it's highly scalable and easy once you start, I'd like to see a real life example implemented both ways and actual problem solved easier with ES / CQRS than CRUD, so I can wrap my mind around it.
Maybe format code on slides better (spaces, brackets ...)