I think one of the best things a coach can do is build a system around the talent he has that puts the players in that system in a position to succeed. The most recent example, in my mind, is the Baltimore Ravens. On offense, they built a system around the talent they assembled, and when it is working it is tough to stop. On defense, they have a philosophy that hasn't changed, and they draft and sign players that fit that philosophy so that success continues. I'm sure there are other examples in the NFL, the Ravens are the most familiar.
If you look at the Steelers, can you say that they have an identity, philosophy or system on offense or defense? If they do, I'm not sure I can identify any of it. It's nuts. The Steelers have some talent, there is no question, but I'm not sure that talent is regularly put in a position to succeed. Doesn't seem like it anyway.