[maxkwallace]

All good points. Haven't read the code so I don't know how deep the similarity goes but the new React Concurrent UI Patterns is at a surface level conceptually similar to Ember's interruptible route transitions, though more fine-grained.

Also really like the new <Suspense> Component! I created a {{render-on-resolve promise=foo}} Component for the app I worked on in Ember back in 2016, and we got a ton of use out of it. If you set up your data layer right, and use it well, it completely removes the need to ever manually manage a loading spinner again.