I asked because it's common to see moderators of forums moving stuff around from one place to another if they think there's a more appropriate place for it.
Yes, and we do so on CC.
However NCA&P is not moderated, it's separate from CC, us mods do not have clearance to move stuff from CC to NCA&P.
However, as I said up thread

any CC member is welcome to start a thread in NCA&P.
You are asking why is an OT thread in plumberschat.net not moved to joinerschat.net by the plumber's forum mods!