You never see a race car driver pull over and change his or her own tires or fill up the gas tank. They have pit crews that are trained to support them. The crew monitors issues and fixes them with expert efficiency. The driver has enough things to worry about and an eye on the finish line.
The same can be said of your team during a go-live or upgrade. There are constant increased support needs, but you want your team driving the car with the on-the-ground work, not changing tires.