I'm not sure how great it is for Netflix's use case but it is important to realize how very different Netflix's use case from most web apps. In general, Netflix data is read only. The only data an end user sends to Netflix that he/she cares about is current position (which certainly works most of the time but doesn't seem enormously reliable) and ratings (which you probably won't know or care if they aren't quickly or accurately updated).
If you're writing a truly interactive system where, for example, you expect multiple devices to be active on the same account working in sync then Netflix isn't paving these paths.
If you're writing a truly interactive system where, for example, you expect multiple devices to be active on the same account working in sync then Netflix isn't paving these paths.