The Pac-12 gets a bad rap sometimes. The conference is generally regarded as the worst of the power conferences thanks to the fact that it hasn't produced a College Football Playoff participant since 2016, but evaluating a conference solely by how many losses its best team has is a pretty flawed approach.
On average, the Pac-12 can be trusted to at least exceed the average production of the ACC.
Average SP+ rating, 2018-20:
• 2018: Pac-12 +6.1, ACC +5.3
• 2019: Pac-12 +5.3, ACC +3.0
• 2020: Pac-12 +5.9, ACC +5.