A core key for the Bears' offense in Week 1 is obvious, but that doesn't lessen its importance.
The headline of Caleb Williams' rookie season was the number of sacks he took (a league-high 68). If he wasn't as mobile as he is, he might have obliterated the NFL single-season record for sacks taken, and a good number of the sacks he took were attributed to him holding the ball too long.
Williams is also not the first, and he won't be the last, rookie quarterback to struggle with pocket presence, the "speed of the game", etc.