Probably has a lot to do with people not knowing that you can apply for renewal outside of the 150 day mark. I've even read on here that some lawyers were telling clients that they couldn't apply outside of that timeframe.
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Self filed AOS │Apps Received By USCIS - 3/18/19
│Biometrics Done - 4/11/19
Interview Scheduled - 4/24/19│Interview Date - 5/31/19│AOS Approval - 5/31/19
Permanent Resident Card Received - 6/8/19