Thanks for the links! Will certainly check them out, might even send me down memory lane a bit when I was first reading about these. Would love a full-fledged recap at some point—it's really interesting getting insight into the the internal mechanics of the problems my UI framework solves for me in my day-to-day. I always come away feeling more informed when you write something, but you've earned a long break after this release, so no pressure!

I hear you on the data fetching and always appreciate your teams' cautious approach. It gives me a lot of confidence in the APIs you all end up landing on, and I appreciate the focus on backwards compatibility and incremental upgrading as opposed to shipping out the first iteration of a cool idea that comes to mind. I know just enough about React to probably shoot myself in the foot with this type of stuff, but add in the idea of concurrency and all that likely falls over.

I think the story here with Relay and GraphQL is really awesome. I hope the Relay team has an article in the future showing off some of the possibilities—I think it makes a really strong argument for itself in conjunction with these features, even taking into account the restrictions you mention. Showing how some of these features flesh out in a more complete framework would be helpful in framing them in a vacuum. Or maybe I'll stop complaining and explore and write something myself!