You’re missing the third: weather. Particularly in the NFL, some teams have high difficulty coping with foreign weather. The Patriots infamously are unable to p

You’re missing the third: weather. Particularly in the NFL, some teams have high difficulty coping with foreign weather. The Patriots infamously are unable to play in the heat of Miami. Green Bay is extremely cold which often limits offenses used to warm weather. Seattle is routinely rainy and makes things easier on their secondary.