And Kotlin's coroutines are also "just blocking and threadpools under the covers", but people will still sing their praises. It's really not a killer for most people using it.

Admittedly it's been awhile since I've written Java, so most of this is what I remember and what I've seen successful teams using -- got any links to a "true async" in Java? I was under the impression that all Java async work was backed by thread pools.