This kind of thing is pretty common with complex systems that have a very long legacy. There's a huge amount of features, many of which are very niche and most

This kind of thing is pretty common with complex systems that have a very long legacy. There's a huge amount of features, many of which are very niche and most people don't even need to know about them. Official docs tend to be unopinionated and cover everything, while third parties create "guides" and similar docs for the features that matter to them. You see something similar with end-user software like Adobe's entire suite where the official docs are basically useless if you just want to learn the common operations quickly and so you have to rely on third-party books and tutorials (like the Dummies books).