probably got mentioned but "weapon type" doesnt really mean anything even now, a weapon has a class aligned to it and your class is defined by the one stated on the weapon, you can use two-handed staffs or wand/clubs on both conjurer and thaumaturge, its just the class is decided by what they choose for that weapon, even if both weapons are of identical type.

But i agree it is most likely a topper system, so you pick a class and then you can have any weapon on it. like XI.