On the second part of the presentation, that's where you see the React team and Dan in particular have no understanding of temporal logic. What would you "hard-code" temporal behavior at the metamodel level? why not deliver a generic structure that would allow anyone to build what they need. Placeholders with timeouts? really? Again, it's all about Facebook use cases. One day all this will go away. We are on a clear path for "temporal programming" to emerge, my best estimate is that it will take about 5 years to add temporal constructs to major programming languages, unless a new one emerges before that...