All points taken and noted... I don't really see any compelling reason why the Martial Arts stunt couldn't be applied the same way to Weapon; but conflict being what it is in the DFRPG, you might argue for the same for some social skills.
I read again the older posts that discussed this issue... part of it is how you cannot "disarm" an unarmed fighter; isn't this mechanically just a maneuver anyways? And being disarmed is really just a narrative effect? It is just the same as "Off Balance" or "Sand In His Eyes" or any +2 taggable aspect that you've thrown on your opponent?
One idea that my group has discussed but never really implemented was allowing the Martial Arts stunt to reduce the threshold for spin with Fists attacks by 2, personally I like this solution because it's flavorful and appropriate to the skill, but it is far from the only option.
I like the spin idea, but not in combination with the +1 to declare... that +1 is actually pretty buffed.
So what would you guys do, allow Fist to have a trapping of "Fist Knowledge" (for lack of a better term at the mo) or apply a "Martial Weapon" stunt requirement? The former seems easier... the latter would require you to examine Guns, social combat skills, ect ect ect.