[riku_iki]

> Some usage types don’t care, some do.

I suspect if you care about threads overhead, you won't pick Java, because there will be overhead in other areas too

> From what I gather virtual threads are an alternative to “callback-hell” (js) or async coloring (python).

there is also existing ExecutorService and futures in Java

[stoperaticless]

> there is also existing ExecutorService and futures in Java

Yes, virtual threads are an alternative also to those. (Kind of)

[riku_iki]

And my frustration is that java had that API for 20 years, it is used everywhere and absolutely battle tested, and now they are adding those virtual threads which break third party libs and make JVM more complicated with various degradations in exchange of benefits most will not notice..