No, not that many. I've worked with C# and .NET ecosystem (WinForms, ASP .NET MVC, NHibernate, EF, MSSQL), later Django/Flask/Python, later Xamarin/Cocoa and Rx, yet later Backbone, AngularJS, React. Haven't worked with low-level stuff at all.
WinForms -> ASP .NET MVC
and then
Backbone -> AngularJS -> React
(including participating in React development) gave you the kind of exposure and experience you needed for Redux.
I think a lot of people reading on here missed this parts and I certainly didn't catch onto this reading your Things I don't Know as of 2018 post or the "Things I do Know" post you linked to.