one thing that stood out to me was that NFL D coordinators have caught up to Shanahan. They are prepared and ready for anything Shanny calls. There are no surprises anymore. D's have schematically shut down the Niners and Shanny hasnt adjusted. He used to scheme guys open, no longer the case. It appears that shanny just calls play now as opposed to creating them to take advantage of the D's weaknesses.
Our D is ass. Making Wilkes the scapegoat has hugely backfired. They cant hold a lead, there are no adjustments, and they are constantly missing tackles. When Bosa went out Sorrysen kept calling plays as if Bosa was still in. Why not blitz with a 5th rusher or something. But nope, all vanilla and got owned again by a division rival in the 4th because of it