I do not see any impressive innovation in its design and the OS doesn't introduce any new concepts or paradigms, which makes it, in essence, no different from r

I do not see any impressive innovation in its design and the OS doesn't introduce any new concepts or paradigms, which makes it, in essence, no different from regular monolithic operating systems, implementing POSIX API with regular system calls. Just a monolithic kernel crudely implementing some well known device drivers as well as already existing filesystems with a block cache, and a POSIX-based userspace with GCC and binutils. That is said, it doesn't mean this isn't an incredible piece of work, especially if written by a single author!! That is definitely a huge amount of engineering that needs some good skills and persistence. I believe it is a very rewarding experience. The product also seems to be really working fine with very impressive stuff.