The author is a kernel developer. He cowrote DTrace and worked at Sun as a kernel developer while they developed Zones and ZFS. I don't see how a kernel guy could only see programs from a high level.
> That is confusing. Maybe he just doesn't like unikernels.
This is true. He has expressed hatred of them for a very long time. I'm not sure why (this article appears to explain it, but I don't feel particularly convinced by some of the points).
