> Just generally the idea that a "clean start", non-POSIX bound OS might design things differently, I imagine. Google's Fuchsia seems to hit some middle ground, where async is more foundational, for example.
Microsoft's (research, discontinued) Midori OS was heavily async:
That's exactly where I was going. Critisim of Linux async shouldn't be discouraged because of inherent limitations. That would hample innovation. I wouldn't be surprised by a new web server, API gateway, load balancer, etc, that mandated "forget about POSIX, adhere to this". The whole cloud abstraction movement seems to enable it.
Microsoft's (research, discontinued) Midori OS was heavily async:
http://joeduffyblog.com/2015/11/19/asynchronous-everything