You are aware that those tutorials were mainly made by Throttlekitty, one of the Nifskope developers and one of the first to answer any question regarding NIF files here in the forums? All gamesas contributed to those tutorials was hosting the Wiki.
This is a tutorial for http://niftools.sourceforge.net/wiki/NifToolsand especially Nifskope. The Oblivion specifics needed to be researched first, this is why those Wiki tutorials were made a year after Oblivion was released. Come time, there will be similar pages for Skyrim, right now there are more important things to do, like a working exporter, or giving Nifskope the ability to create Skyrim collision data. So be patient, try to get familiar with the tools we have and why not start a wiki page with your own experiences from a beginner's point of view?
As for gamesas: They never saw or used the Nifs like we modders do in Nifskope, for the programmers that created the NIF-structure it's just heap of data that needs to be moved from the 3d-modelling program to the game engine, and for the artists it's just a few options in the exporter dialog, If something doesn't work, they ask a programmer to fix it, and don't open the NIF with a tool like Nifskope to fiddle with the raw data until it works as intended.
The only NIF support gamesas ever gave to the modders was the 3DSMax exporter for Morrowind NIF files. Of course the exporter is useless without 3DSMax - a $3500 program - let's have a guess how many modders pirated themselves a copy or gained it by fraud (claiming to be a graphic design student). Even if gamesas has the right to release their own exporters, I can understand that they don't want to encourage us to actually use them.