Joined: June 2004
No, I think that we do have to consider thaty the actual observed unity is one of solutions and that it is not clearly an aesthetic preference. THe Common Descent explanation expects these elements to be highly conserved, the Common Designer explanation has no basis for choosing these elements over any others. Nor is there such strong grounds for expecting a single unvarying "style" over such a wide range of - supposed - designs.
So in this instance Comon Descent is the superior explanation because it is more constrained in what it could potentially do.