My experience is that most Java people didn't switch to other languages nor to async abstractions. So this will not have people revert lots of work, just improv

My experience is that most Java people didn't switch to other languages nor to async abstractions. So this will not have people revert lots of work, just improve their existing way of working. If one's only reading HN it may be easy to think of Java on the decline and almost dead. But I've done lots of greenfield java projects (or, mostly Kotlin, but still on the JVM) various places until recently (when I switched job).