If the playoff was in the 2021 season the Pac 12 would not have made it. Maybe the Pac 12 is too low for a easy playoff spot.
In the 2021 season, the PAC absolutely would have made it. The 6 highest ranked conference champs were
- Alabama (#1 overall)
- Michigan (#2 overall)
- Cincinnati (#4 overall)
- Baylor (#7 overall)
- Utah (#11 overall)
- Pitt (#12 overall)
But more to the point, it depends how you define conference strength. This is not intended to represent the PAC and the Big 12 but consider two conferences.
Conference A has 3 perennial top 10 teams...and 9 other teams that fall anywhere from #80 to #100.
Meanwhile every one of Conference B's 12 teams is in the #20 to #50 range.
Which conference is better? Which is easier to win? The answer may not be the same.
Best depends a lot more on depth. Easiest to win depends a lot more on the top end.