Your main points appear to be "the difference is the reduced level of service and resources from Ancestry.com when a Public Tree encounters a Private Tree. . . . . there are differences between Public and Private trees with regard to each researching the other and Ancestry.com needs to address it!"
Remember that the trees are uploaded by individuals. True, nearly all consist in material lifted from other trees. You appear to believe that Ancestry.com owes you access to everything uploaded by everyone.
Trees "each researching the other . . ." ? Trees do not do research. People do. Most submitted trees, however, are not the result of research in records. What you mean is that you want access to all instances where someone may have information you want. Many who have done actual research do not want the results of their work, their time and their resources to be simply lifted by others, and have made their trees private. Those who do not want others linking to their trees, who do not want others lifting their photos, documents and transcripts, etc., have often made their trees private to prevent this sort of activity by tree vampires.
Other tree submitters do not have a "right" to such data as has been made private, but can request it. If the owner of a private tree declines to share it, that is their right.
The best way to get accuracy in your tree is to do the actual research in local records yourself.