[ijk]

Technically, the Oracle is supposed to dispense enough information to figure out most of the important stuff.

Of course, you'd have to be good enough at the game to survive to the Oracle and have the cash to pay for the major consultations. And you'd have to know that information source exists.

Since Nethack is a game where not knowing the details of some minor edge case can and will kill you dead, or deader than dead, I don't know of anyone who actually relied on that (though there may very well be someone).