This same thinking has been seen in compute models of mechanical structures. People have abandoned older classical methods for the easier computer models. The problem is “garbage in garbage out”. Just because you have other methods of analysis is no reason to abandon tried and true methods. Believe the results if they can be confirmed by multiple methods.
Um, I think saying that "abandoning" fossil seeking is being advocated is a bit of an exaggeration. I don't think anyone is saying that since have this new avenue to pursue we now have enough fossils.