You bring up a great point that later in the season the game gets more physical as:
1. refs let them play
2. injuries wear down certain teams
3. the weather gets poor
A lot of throwing teams tend to do great early in the season in warm weather only to falter later when they can't rush on 3rd and 1.
Is McVay's offense better early in the season and not built for December/January? Zone/Wide concepts less effective later? We've seen them struggle in the redzone even in good weather. Will be interesting to see if some of the same issues come up this season.
I would argue that Stafford is better built for the end of the season when it gets cold due to his arm, ability to throw off-schedule, and experience.
As to accuracy, Stafford is plenty accurate. I don't think he is as accurate as Goff from a clean pocket but likely more accurate from a dirty one. What he may lack is touch in certain scenarios.