There is something incongruous about the very notion of genuine immutable “taxon-defining novelties” if Darwinian evolution is true.
There is no reason for believing the major Type-defining homologs, such as the feather, were achieved gradually via functional continuums.
If many of the taxa-defining homologs are non-adaptive, the whole Darwinian enterprise breaks down entirely.
Today is Darwin Day, marking the birthday of Charles Darwin, who is celebrated around the world as a secular saint.
If nature is so fine-tuned for life’s environment, might the fine-tuning not also include a set of laws of form, geared to actualize the forms of life on earth?