We should remember to distinguish between concurrent, parallel, and asynchronous programming. UI is a bad example for the reactor pattern, since the reactor pattern is for concurrent processing and UIs should usually process events sequentially (but asynchronously). That's just a bog-standard event loop, not the reactor pattern.

"Practicing" different concurrency patterns sounds like a lot of tedious effort, and the suggestion to "go back to Node" seems a bit high-handed to me. I would encourage everyone to pick and choose what expertise they want to develop.