James Gasik
We don't talk about Pun-Pun
It is interesting that modules didn't bother with them, but many products post-PHB basically assumed they were in play, like Kits (the Thief-Acrobat basically said: "if you're not using proficiencies, your Thief-Acrobat gets proficiencies")*, and most campaign settings added a few.This doesn't quite qualify as an obscure rule, but I loved the Etiquette non-Weapon Proficiency. For me it also captures the fundamental difference in approach to this stuff between TSR and WOTC era:
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The entry was a little different I believe in the 1989 edition of the PHB (this is the black cover revised that came out in the mid-90s). But don't feel like digging for that in my stack of books.
I just like that it preserves the RP by having it function more like a knowledge skill
Also NWPs being 100% optional and one of two major methods in 2E, is something I think a lot of people missed (I have gamed with a number of folks who seemed to think they were core to the game----but most modules I played didn't even bother with them).
I could only assume the rulebook writers loved them and the module writers either didn't, or couldn't assume their use.
*Heck, the Bard in the PHB gets bonus proficiencies and there's no sign of a replacement if the "optional" rules aren't in use!