Because the framing is wrong and click bait... As anyone with many cores can tell you: Those are used. The issue us more subtle: "[the minimum granularity] is

Because the framing is wrong and click bait... As anyone with many cores can tell you: Those are used. The issue us more subtle: "[the minimum granularity] is supposed to allow tasks to run for a minimum amount of [3ms] when the system is overloaded". That's supposed to scale with number of cores, but the scaling us limited to 8 cores. However, imho that's not even necessarily a bad thing. It's a trade off between responsiveness and throughput in overload situations. You don't want slices to become too tiny/large...