The problem I see is that it's a new process that is evolving during the regular season and the criteria for overturning a call has changed.
There was an outcry about plays that were clearly PI early on and not overturned and the past couple of weeks are now being called.
So what wasn't meeting the standard for overturning or implementing a PI the first half of the season now meets the standard. The inconsistency of the standard changing in midstream of the season is a bad look and particularly for teams that didn't get calls going their way early on and are now getting calls going against them.
In other words, this is just a typical way in which the NFL implements rule changes.