You are being deliberately dense. If no existing JVM gives runnable objects their own stack, then it's impossible for a java developer to create thousands of th

You are being deliberately dense. If no existing JVM gives runnable objects their own stack, then it's impossible for a java developer to create thousands of threads (without creating their own JVM, which is totally unreasonable 99% of the time). It's a practical impossibility. Is that so much worse than a technical one?