@william3 I would challenge that it is not unethical to breed two doodles but if you are going to do so you need to know their parental history. The ultimate goal (if you are only using the coat gene for confirmation) is to breed 2 FF doodles. Since it often considered that people are wanting to a doodle for it to be low shedding but have a different temperament than a poodle, constantly breeding back to a poodle would make having mixed the breeds in a first place silly.
Rather an ethical doodle breeder will track the genetic markers present in the parents so they can note what generation and coat type they expect their puppies to have.
I would also argue that there is a lot more that goes into ethically breeding doodles than just coat type. For example desired size, desired temperament, genetics and health factors as well.
As a side point I believe a truly good doodle breeder will work with the existing doodle and cross community to specialize in understanding and building their specific doodle cross to the standards of there community. In other words Labradoodle breeders need to be working with other labradoodle breeders to build the labradoodle “breed standard” and Aussiedoodle breeders need to be doing so with Aussiedoodle breeders. I find it to be a large red flag when a doodle breeder is bereeding many different doodle types. To be a doodle breeder you need to be an expert in the poodle breed, the mixed breed, and your particular doodle breed. This does not leave room to be an expert in multiple types of doodles as a good doodle breeder should already be active in three different dog breed communities, many breeders only ever specialize in one. But that’s my soap box and I will get off it.