Replace entire turbo or just vgt actuator?

[Mrkentee]

As far as I know, the actuator and turbo assy are two different parts. I never heard of the whole thing being replaced as one. The actuator is a few hundred dollars. Why in the world replace the whole thing together?
And since it's not that old, check the wiring to the actuator and make sure it's not damaged or resting against anything hot, etc.