There's Absolutely No Doubt the NFL Created This BS Pass Interference Rule to Appease Saints Fans
By Michael Luciano

Anyone who watches the NFL could have seen that the league trying to make pass interference calls reviewable was going to be integrated into the game as seamlessly as a brick in a washing machine. Somehow, it's managed to be even worse.
Given the subjective nature of the call, referees and coaches alike have little-to-no clarity on what constitutes pass interference.
This pass interference review stuff in the NFL has to just go away. Mike Pereira just said, “I think we can all agree that was pass interference.” Then went on to say it shouldn’t get reserved. So why have it? I just don’t get it.
— Will Manso (@WillManso) October 11, 2019
So why is this even in place? Because New Orleans Saints fans continue to throw hissy fits to this day over the missed call in last year's NFC Championship game and the NFL needed a way to shut them up for a bit.
Rather than create clarity and advance the cause of "getting the call right," the league has gone totally off the rails. Such calls are rarely overturned, obvious non-calls and flags are not being challenged as a result of indecision, and there appears to be no solid answer as to how to fix them in sight.
Everyone: That was Pass Interference!
— Eric Mahanke (@EMahanke) October 11, 2019
NFL: whoops we missed it..
Everyone: you should be able to challenge those calls!
NFL: ....ya...ya good idea ok
Everyone: That was Pass Interference!....ok yes we challenged
NFL: wait you thought we were ACTUALLY going to change it?
Nickell Robey-Coleman changed the league forever, but not in the manner he was hoping. The refs are going to miss pass interference calls and then miss them again upon review because the league doesn't want replay review affecting the game at such a high magnitude.