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> No one (besides us engineers) knows or cares what Facebook is running on. Same with many other productions (not only software) out there (when was the last time we cared exactly how an Oreo cookie was made?).

Except for the people that complain about performance?

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I tend to complain more about interactive state issues, Redux (or other flux-like options) helps a lot there. Performance is usually a little further down, unless it's many seconds for response. Lately every time I see weird state management issues it's almost always an angular app. And depending on what you're doing, that can be outright exceedingly painful in Angular 1.

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