I think they mean things like asynchronous updates of backend data that occasionally sync out of band. Most apps I’ve seen will make requests and not act “optim

I think they mean things like asynchronous updates of backend data that occasionally sync out of band. Most apps I’ve seen will make requests and not act “optimistically” on them, rather wait for the round trip to complete before continuing. I think the reason we don’t see this much is because you have to model your entire app on this (with multiple layers of data state and primitive types that represent sync-able states) and most apps aren’t written with that much forethought.