What a few of you are noticing is the benefit of having different skillsets. Charbs wasn't drafted to be a Murray backup but as a complementary piece. He's a downhill runner who runs hard, blocks well and has good hands. He contributes on special teams and is a good chance of pace back/goal line back/third down back.
With the benefit of hindsight, Charbs probably did hesitate too much yesterday. The Patriots front seven was better than expected and the running lanes were clogged, and he erred on the side of trying to find a big play when that really isn't his skillset. He's better off just decisively hitting whatever hole there is and driving forward with one occasional cut back. Murray would have done better on some of those carries as an extremely explosive runner who can occasionally turn nothing into a home run.
That doesn't mean that Holani or McIntosh should have gotten more play - I like them but neither of them are Kenneth Murray. Sometimes you are missing a key player and that's just how it is.