Under normal circumstances, comparison of how cases are progressing ends at the bio stage. After that, it makes no difference since each FO operates independently of one another, and there are other several factors which comes into play during the process. You can have 3 to 5 people who filed at the same time with one or two completing the process within one or two months of filing (because their FO is typically not super busy compared to the rest); the additional two finishes within 3 months of filing (average processing time for each of their FOs); 5th person finishes 7 to 8 months after (because of delayed background check clearance). As such, this trying to compare cases based on filing date makes no sense to me.
Ideally, organizing by the FO, and the filing date is an alternative, but I don’t have the time for that. So, organizing based on current month makes more sense since most AOSers tend to file around the time they become current. Everyone has an idea of how they would love to see the spreadsheet presented, I can’t change the process to accommodate users who do a last minute to switch to AOS and subsequently couldn’t file when their CNs became current.
In addition, (my opinion since I own the spreadsheet anyways), organizing the list based on current month is easier on the eyes in terms of aesthetics.