IMHO there is nothing so fundamentally complicated about the Oasys that it requires that much explanation. You have a bunch of MIDI and audio recording concepts that have been around for years (decades!) and it's operation and structure are way simpler than something like a modern DAW. KARMA is a different kettle of fish, but there are a bunch of supporting materials for that and we have such great access to SK.
You could watch a video from the M50 or Triton right now to get the basic gist of how things work in a Korg workstation, it would be applicable for the most part to the Oasys. It wouldn't elevate you to the state of Korg Workstation Guru by any means, it would only cover the basics and the terminology.
The Oasys is to me totally self-explanatory operationally and the paradigm is very simple. It's also widely used in other gear. There is just a lot of functionality available and learning to bring that to bear creatively requires one thing that Korg can't provide ... TIME ! ... and a willing to spend that time exploring and learning. Reading the manuals won't get you far either, they are just about how it works rather than how actually use it.
Maybe I have a radically different view point and I am talking out of turn, but there is nothing in the Oasys I haven't seen before, and I suspect the same goes for many of the more experienced folks here too. What's novel is the depth of it. Looking at MOD-7 after FM7, or the MS20EX after using the MS20 AU, it's all very familiar indeed and easily understood, but there is a lot more available and a lot more creative avenues to explore. But it's still just MIDI and old school synthesis, and those techniques are so massively documented already. So it's a case of finding the time to play with and learn what you do and don't need to make your music. Plus as Francis Preve said, we are so lucky that all the factory material is "open source", it is the greatest learning resource we could have and a unique aspect of our particular world (synths and musictech). Just looking at a favourite program, combi or demo song is like taking a class with some of the greatest experts in our field. Dissecting those thing and getting interactive with it, is far more information than watching some holding forth on the TV.
That's my perspective ... I can imagine others might not see things the same way, and I am not trying to be contradictory
Daz.
p.s. this topic reminds me once again how lucky we are that Mike bought the Oasys and combined his expertise and community spiritedness.