Agreed. I veiw it very similarly.

30s: nonrosterable
40s: backup
50s: below average starter
60s: average starter
70s: good starter
80s: probowl caliber starter
90s: all pro caliber starter

To be clear, in any given year there are only a handful of guys who record an overall score in the 90s.

For context, in Rodgers 2020 MVP season, his PFF grade was 95.1, the highest single season for a QB in PFF history. The highest graded season by any player in history was Trent Williams in 2021 at 96.6.