And, back in 2012, cores were expensive. Now we have more cores than software to run on them, and having the kernel and user-space in respective busy nop loops

And, back in 2012, cores were expensive. Now we have more cores than software to run on them, and having the kernel and user-space in respective busy nop loops waiting to get something is finally something to fill them up with? The dynamics and mechanical sympathy of different approaches are changing as hardware goes massively parallel faster than software can.