[jsmeaton]

The second image is of IIS running on Windows, not Apache. Different software on different OSes. Regardless, it doesn't seem like parent is making the argument that the NT kernel isn't complicated - just that it is superior.

[bitwize]

It is more complicated because -- surprise -- I/O usage patterns do not fit in one neat little box, and you have to provide special handling of special cases that do occur frequently in the real world.