Maybe because one team in the conference was actually the best in the NFL and not actually the 16 Team Conference is better than the other.
All because the Broncos won doesn't mean the AFC is better than the NFC
It only meant the Broncos were better.
By this Logic
The Bengals are better than the Seahawks because "Broncos won the Super Bowl"
That logic is poor and lacks clarity
because it barley explains the talent of other teams