It wasn’t a big deal but I would have still appreciated it if the author inserted some new recorded segments or re-recorded some content to make up for it.
I think you are confusing interiorizing some fundamentals with things moving fast. There are languages and frameworks rolling out higher level support for features covering concurrency and parallelism. While you focus on thread-safety, a framework you already use can and often does roll out features that outright eliminate those concerns with idiomatic approaches that are far easier to maintain. Wouldn't you classify that as moving fast?
React is just a formalizatio of a UI update pattern that exists in every app ever made except the ones that are bad. Source: written a lot of java and nobody is currently paying enough to make it worth doing again.
In ten years you'll see greybeards complaining that new kids don't know shit about React fundamentals.
Nah you won't. Js frameworks comme and go all the time
