break in
In the Krieger video, he states a moderate break in, addressing tool marks in the throat. In that same series of videos, David Tubb, world class shot, says basically the same thing. George Gardner, precision rifle builder, also states to do a mild break in. That's pretty convincing to me.
A shoot and clean process for say a dozen rounds, will not hurt anything, and may help. So why not? My own practice for a spanking new rifle, is to clean it, then shoot and clean for the first 5 rounds. Then I shoot 5 and clean, and clean again after the next 5, and then I'm calling it "seasoned" or broke in. Usually, I perform this process as I zero the scope.
With an average barrel, and average ammo, and an average shooter, the difference may not be all that discernible. But if you DON'T do a break in, you won't know if one might have helped either. For the time and patience needed for my 15 shot process, I'll invest in the process and hope for the best.