What kind/class of issues are caused by "thread interleaving on the scale of nanoseconds"?
Faulty CPU bit flips due to radiation/quantum effects or what are you referring to? Just curious.
Not doing things atomically when they should be (incl. missing locks around tiny ops) would be a pretty large class.
With native multithreading data can pass from thread to thread millions of times per second, and you're much less likely to hit obscure interactions when limited instead to maybe a couple hundred context switches per second.
