I never mentioned my answer - All books should work with each other and be interchangeable, but the DM decides what to allow.
I did know several players during the 3.x era, though, that would argue with a DM about what they want to play because it is in a
WOTC splat and therefore should be allowed.
Sometimes, they argued just to see how far they could push the DM before they put their foot down, but that's a different thread entirely.
I was just wondering if this mentality will be amplified because of the "everything is core" mantra.
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