Because if the ultimate goal is to win the SB, you do that by being the better passing team. That has been the trend for the past 10+ years in the NFL. Here and there a dominant run team makes an appearance and then (usually) gets taken out.
Whether it resonates with you or not really doesn't matter. I can not think of a team that has taken home the Lombardi since maybe Peyton's last one with the Broncos who hasn't won the SB on the back of high end QB play. Even that Ravens team that is mostly remembered for defense and running the ball had Flacco put up video game numbers during the playoffs.
So what would be the point of planning on having a run heavy approach? Go 9-7?
Seattle has lost in the playoffs recently by backing off the "let Russ cook" approach and letting "Carson plod". Packers lost when they took the ball out of Rodgers hands.
Do I want 2020 or 2021 Ben Roethlisberger carrying the team on his back? No, because he can't. But did I want 2010-2018 Ben doing that? Absolutely.