As far as my understanding goes, there are 2 main reasons: 1. The very specific nature of the OS, which aims to be (in theory) very modular 2. You need to partake on a very clear idea of what software freedom means, in every sense of the word

I don't use Hurd, but I do get it. I feel it's quite simple.

Just because it isn't there yet doesn't mean one wouldn't want to hack on it from time to time