The question of "single UI or GPU bound thread" could be solved in a future release with custom virtual thread schedulers. Java 21 concentrates on solving the problem of server-side applications.
I think it would require new paradigms, though. The existing popular patterns assume cooperative concurrency. We've had preemptive threading for a long time and UI programming has not made inroads with it. I don't see how using virtual threads makes this an easier lift.
My fear is that we'll end up living with a bolted on async/await style for this stuff but with worse syntax. Still, I'm excited to see how it shakes out.
