In my mind user-mode threads are much more about engineering productivity than raw performance. The comparison is wasteful blocking network calls using threads

In my mind user-mode threads are much more about engineering productivity than raw performance. The comparison is wasteful blocking network calls using threads written in a simple synchronous way vs efficient user mode threads making network calls in a non blocking way also written synchronously. Today to get non blocking efficiencies you need to write async code bc without loom there is no otb user mode threads, even if user mode threads aren’t as efficient in raw numbers it’s still waaay ahead of the predominant way threads are used today in Java (mostly wrt network calls).