JudasIscariot: The one that irks me is the lack of details in some game mechanics. For example, if I want to play a spellcasting class in Poschengband then I need to go google some spoilers page on some server God knows where just to see the spell list for a given realm. Why can't I have this in the game's help files?
dtgreene: What if the help files are incorrect? (I have seen this many times, whether in the help files, the printed manual, the in-game description, or otherwise, that the spell does not work as described.) I would argue that, in some cases, that might actually be worse.
Also, what does "Instantly Slays a -1 Demon" even mean? (This description comes from Elminage Gothic, and the spell in question is actually a general purpose attack spell.)
The help files are correct, it's just the typical roguelike thing to do and that is leave spell lists or other things out entirely. Nethack practically requires that you look up spoilers and the like.