I will answer in brief…
UI: it is important, but the magic is done elsewhere
documentation: I agree with you 1000%
knowledge: it is needed if you want to develop (at internals level) or simply administer it (knowing how to edit a conf file or adapting it “in the NS way”); obviously the first level is quite higher than the second.
finally, I repeat: I see many people here just begging for features or complaining for missing things… all of that without knowing in what NS is different from the others distro… guys, test it, break it, try it, play with it and enjoy yourself
that’s all, I won’t add more in this and related topic (discourse is complaining that I’m posting too much)