It's nice, but the negative side effect of potential for Familiars is the fact that all of those special effects Familiars give disappear.
Already registered Familiars, pre-potential, will keep their special traits, like drop rate boosts, but newly registered Familiars will not have these special traits. I can't confirm this 100% myself, since I don't use Familiars... ever... but this is what I've been told.
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