As a DM who already has had problems with players trying to take options that aren't being used as part of a particular campaign, I'm all in favor of having to explicitly enable new purchases on existing characters.
Currently Running: Pathfinder Second Edition
Currently Playing: Pathfinder First Edition, Star Trek Adventures
Former HL Games: D&D 4e & 5e, Mutants & Masterminds 2E & 3E, Savage Worlds
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