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For example, if the Elves of Ravenholme have a signature underhanded twirling dagger throwing style, it's less problematic to explore how that can arise from a combination of feats rather than add a new feat with prerequisites "Elf, Rogue, origin Ravenholme, wielding a dagger". Rather than introduce 20 new feats for Ravenholme, it'd be better to discuss one feat that twirls weapons and can be used in many interesting combinations. Sure, that means that the crunch magazine articles need to be structured differently (around a technique, not a fantastic location), but it allows the same number of interesting choices while having far fewer options.
I'm much happier with a label (not pre-requisites) 'Elf, Rogue, origin Ravenholme, dagger'.
When I go through my decision tree there are many opportunities to sort or ignore this piece of information.
If I do not use Ravenholme or their elves than I can discard this information. It is like the library is filled with books that I will never read despite being written by fine authors but I only have so much time and effort to spend on things. I manage the glut of books by deciding non-fiction is not stuff I am currently interested in reading.
If I am not currently looking at making a Rogue character than again, I can choose to set the feat aside until I am making a rogue.
If I have met all the other conditions than I can decide if I am looking for a feat to improve my dagger techniques or decide if something else (singing, wilderness lore, stealth) might be what I am hoping to improve in my concept.
I can also decide if this dagger feat compares better or worse against other dagger feats and weapon feats.