Clearly, this is very powerful. But I feel further tutorial(s) would be of benefit.
Reading the 3 articles found here is a must, but it would be nice to see a full example where the author explains their intentions for the example (e.g. “I have 5 people, belonging to 2 factions. One is a traitor, while 2 people are rivals. A secret map item belongs to 1 person, but 2 others know of its existence.”) and then defines new data types and relationships based on this. (For the purposes of said example, ignore the existence of templates, by the way.)
Sometimes, both in the views when using items, and while editing data types, choices will be grayed out/disabled. Please remind us why, when appropriate.
Also, I would skip the most elementary details, such as assigning colors, icons, etc to new types.
Here’s me hoping someone has the experience and patience to create such a guide. I’ve watched most of Rob’s video, but my poor German is letting me down.