Because in my opinion, it starts to make sense if you understand what's going on behind the scenes with Go.
Hugo always struck me as an SSG for developers who want something in between the super-easy to use, with zero experience and, well, starting from scratch with every site.
Admittedly, even with a Golang background, I find there is quite a learning curve, so I wouldn't recommend it for anyone who is just trying to get their blog online.