The New York Giants haven’t been able to change their offense significantly since firing Jason Garrett. It’s just too late in the season to make a move like that, and the Giants are for the most part stuck with the same basic system until the offseason. With that being said, there’s still some advantages from making a change during the season at offensive coordinator.
While you aren’t going to see many NFL players publicly throw their coaches under the bus, you might get the idea from certain players’ statements that Garrett wasn’t the most popular coordinator.