[factorial]

You must be joking! The book you are referring to accompanies a course called "CS116". What about digging through some graduate school course catalogues instead?

Of course Kernel development isn't impossible. Otherwise, there wouldn't be any kernels in the first place. But of course it is the domain of a rather small number of people.

[nullnullnull]

I'm well aware of the course, what exactly is your point? Your second part of the sentence makes no sense either, what is your point?

I've demonstrated that kernel development, although "hard" is possible even by students (hence the reference to the book and its related course).

You have offered nothing in response.