I had Spangled Russian Orloffs that rarely crowed. They have been the quietest birds I ever owned. You might ask around to see if my birds were an aberration or if it is common for the breed.
Animals adapt. I think if you bred a short crow or quieter bird they would find an alternative communication tool so I don't see it as cruel. Besides, these chickens are not going to be running wild in a jungle. They are being bred for suburban neighborhoods. Situations where the hoa is forcing...