Just a few thoughts here. I think there are a few reasons that the 4 team had lost so many races than they should have won. One, Harvick had shown that he struggles on restarts, and with so many races coming down to a GWC, it's easy to see why many slip away. Second, his pit crew has been very inconsistent, especially with pivotal stops. And third, when a team has such a dominant car, it puts the rest of the field in desperation mode where they are willing to take risks with pit strategies, often doing the opposite of the leaders. Sometimes being the dominant car can be a disadvantage.
Regardless, I think being a dominator and letting some races fall by the way side is better than being mediocre and being an occasional closer.