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&#x27;s just a bog-standard event loop, not the reactor pattern.<p>&quot;Practicing&quot; different concurrency patterns sounds like a lot of tedious effort, and the suggestion to &quot;go back to Node&quot; seems a bit high-handed to me.  I would encourage everyone to pick and choose what expertise they want to develop.