I think the point is that the neo-Darwinian synthesis does not kill off the central thrust of the principle of natural selection, which was what Darwin established on the basis of his observations as a naturalist.It would be far easer to discuss Darwinianism if you called out something from OoS that you think is correct AND is unequivocally explained ONLY by the "Theory of Evolution".
Since then, the mechanisms that give rise to variation, mutation, sexual recombination, sexual selection and so forth have been discovered and helped to complete the picture. The things that Darwin got wrong aren't central to the theory of evolution by natural selection. He was still right, and brilliantly so.
Can you think of another field of science that has not undergone a radical change of basic principles since 1859? The principle of natural selection remains while other fields were revolutionised through the discovery of the atom and its contents, relativity, quantum mechanics, plate tectonics and modern cosmology.
Did Darwin get anything important wrong? Has the neo-Darwinian view made any radical changes?
Stuart