Yes, winning national titles requires VERY good talent. That has been shown with the average recruiting rankings of winners over the years.
But forget national titles. We're not in that realm, and really won't be. No one here is seriously talking about winning national titles anyway, so that's a moot point.
Think Spurrier at Duke, Chadwell at coastal, meyer at Utah, think any coach that has succeeded at a lower level (lesser talent).
One thing you should stop doing though, is arguing that coaching makes no difference. Is the concept of multiple factors really that far beyond your grasp? Must there really only be ONE thing that impacts success in your mind?
We're in the SEC and the year is 2024. Everything is maximized. You need a good CEO that can bring in the best talent you can and competent staffing just to keep pace. If you don't have that, then you would need to move on. However, there's little to no evidence to suggest that right now for Beamer. It could be on the way though. We have to wait and see.