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Its been done before. Butterfly Sting was changed to a Desna only Feat. The problem with Dex to Damage Feats/Abilities is, (I believe), is that folks at Paizo have different ideas on its overall power level. Some think its way too strong, and in general I agree, while others see it as strong, but needed.
Going all the way back to PF 3.5 days, when they allowed Dervish Dance to be a limited/restricted version. The impression I get from Fencing/Slashing Grace is that someone was trying to push them through despite the other Paizo staff being against it, and the various nerfs are ways to correct them getting in print anyway. Being that it came from the ACG, (and Adv Class Origins), which was filled with similar problems all around, to me suggests that they slipped through unintended.