[pjmlp]

Still way better documented than most FOSS software that isn't an copy of any century old UNIX utility.

Just like on any many FOSS projects one gets the actual valuable documentation by buying books.

[Longhanks]

Well, with FOSS projects, you can at least have a look at the source. Won't replace proper documentation, but that's still better than "reverse engineering" binary tools.

[cptskippy]

Which is not really an option for your average joe.