People seem to forget that division winners getting an automatic home game is a relatively new development.
1990 was the first year all division winners got the added revenue of hosting a home game.In the old NFL (pre-Super Bowl), the teams that won the two divisions would meet, but the site would rotate every other year between divisions, which is why
the 1951 Cleveland Browns could go 11-1, including a win at the Los Angeles Rams by 15, and still have to play the 8-4 Rams on the road for the championship (and lose by a touchdown).
After the Super Bowl era began, but pre-merger, the NFL had 16 teams, 4 divisions, (just like today) but no wildcards, and the best division winners weren't guaranteed home games. This is why,
in the 1967 season, the Colts could go 11-1-2, tie for the best record in the league, and miss the playoffs entirely with a loss in the final week to the Rams. And why the Rams, despite the 11-1-2 record, had to go to the frozen tundra of 9-4-1 Green Bay in the semifinals.
After the merger, and prior to 1978, the division winner with the better record still didn't necessarily get home field advantage throughout the playoffs, as it was pre-determined and rotated.
This is why in 1972 undefeated Miami had to play at Pittsburgh in the AFCCG. Or the two division winners with the best records in the NFC played each other, with Green Bay at 10-4 going on the road to Washington, while 8-5-1 San Fransisco hosted a playoff game.
So yeah, claims that this league was historically built upon the division winner getting that extra carrot of a home game may be revisionist.