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I think the argument is that it would be useful to allow straight reductions of traits as an exception to "must cost at least 1 pp" so that someone with an Alternate Form that's less agile can simply say that their Dexterity is -4 when in the form instead of having to find a counter-balancing trait to pair it up with, assuming there is one. I'd be fine with it being a custom extra or the like which lets one ignore the "at least 1 pp" rule.
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