Technically warder can use other weapons, but you can't use void or block and I'm not sure if you get gxp.
Fremen can use other weapons as well.
Gentech are reliant on mud weapons, as are priests I think. Mages on 3K use some mud weapons like daggers and staves, not sure about 3S.
I think witch uses mud weapons as does necromancer.
Jedi has a lightsaber guild weapon that's pretty necessary, though early on you'll use mud weapons until you unlock lightsaber combat and have the money to craft your saber.
Changeling can use mud weapons in human or gorilla form, though they get no gxp for doing so.
Juggernauts wield a mud weapon.
Sii wield mud weapons in some of their forms.
So yes, there are definitely guilds that use mud weapons instead of guild weapons.
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