My impression runs counter to the consensus.
* N-400s are accelerating I-751s (though in our case we were approved for I-751 before filing N-400
* New N-400 cases are being prioritized over everything else (including old N-400 cases) in most field offices. There has never been better time in the last 8 years to file N-400 than today.
So effectively 3 year cases are getting more love.
My wife has been a LPR for less than 3 years and her N-400 interview is scheduled for January 31, which is 3 years plus 4 days after she became an LPR (January 27, 2020). Exactly 90 days after we filed.
i was pretty certain she would get a fast interview as reports (mostly on Reddit) were saying for years that Tucson was fast. We moved to southern Arizona partially for this reason. Meanwhile, San Jose, near where we lived before is 3 times fast than when I filed in 2017.
We held off filing relative to the 3 year anniversary date of her “residence since” date because that date is false. USCIS back dated her gc to the interview (January 16, 2020) and not the approval date (January 27, 2020).
If anything, those filing on the basis of 3 years need to be careful they are not interviewed too soon. Some field offices will deny the case even if it is their fault. We would have canceled the interview if it was scheduled January 26, 2023 or earlier.