The playoffs show us the state of the NFL.
You need good solid D, but it doesn't have to be all world. Scheme is critical as is adaptability.
What you DO need is an all-world Offense. The NFL Rules simply favor it.
And the rules favor passing the ball. A lot.
But what we also see is that teams play mostly from the shotgun. Fisher's insistence that Goff HAD to be a drop back passer first is just flat ignorant and stubborn.
You can win with almost any combination of Receiver types. Small and quick (Pats), big and fast (Falcons). But they have to be smart, have good hands, run good routes. And you need at least 4.
If your Oline can't give the QB time, it is lights out....I don't care who you have as receivers or your QB. Green Bay could not keep the Falcons off of Rogers, and that was the game especially when the Falcons could almost score at will.
In the end, offense is about the QB. Forget "running the offense through your RB" (again, Fisher's antiquated philosophy).
And the QB doesn't have to be especially mobile, but he does have to have good pocket awareness and movement. Some ability and mentality to run when it is necessary is helpful.
What a QB must have is accuracy, an amazing field awareness, and a savant's knowledge of the offense.
What an offense needs is a widely diverse playbook. And it can't have a single "go to" guy because the D can often take that guy out of the game and thus greatly diminish the offensive production. The Falcons and the Pats have complex offenses with a lot of WR reads. The D can't guard everything. The Steelers were simply overwhelmed, as was Green Bay, with the enormous variety of plays and looks thrown at them.
That is the NFL today if the Superbowl is really your goal.
It was critical that the Rams hire an offense oriented HC. They did. So that is certainly a point in their favor.