This is true, and in an ideal world we would definitely leave it up to the operating system. I would love to see the Linux kernel get so good as massive paralle

This is true, and in an ideal world we would definitely leave it up to the operating system. I would love to see the Linux kernel get so good as massive parallelism that we can simply do it that way. But as far as I know, it's still not competitive. Which makes sense, since the kernel offers far stronger separation guarantees.