It may have been born of the megarenter abuse, but take care not to mistakenly assume it won't apply to you, when in fact it could be a miscommunication or, as you said, owner services has rudimentary information. I can't imagine how they could reasonably draw a line between the abusers and the casual owners, a line so succinct that they can apply rules to one subset of owners and not another.
I don't believe they were correct in telling you Wyndham will decide from which bucket to fulfill a reservation (I'm professing this as belief, not knowledge). The new points screen they shared makes it look pretty clear to me that when you make a reservation, you will choose what bucket you want decremented. And this goes beyond developer vs resale....If you want to preserve CWA points for ARP, for example, choosing a non-CWA bucket to fulfill the reservation will allow you to do that. I envision it like a bank transfer where your banking app gives you a dropdown list to choose which accounts you want to transfer from and to.