[trgn]

`One thing that I'd love to be able to do is to have the data as plain-old-objects, updated frequently from one thread, and the gui living on another thread that observes it occasionally in a read-only fashion`

Dojo-stores, observable-collections essentially, were like that. A Dojo-view was a monitor for this. A very simple, elegant model-view design.

I agree that we should embrace mutability. The JS-code most people write now has horrible performance characteristics since we do not take advantage of the benefits of mutating objects to manage state. Instead, in JS-world, we recreate and duplicate state all the time, spamming the heap. One library doing this is not too bad, but all libraries doing this is the main cause of slow web apps.