I bed the sides of the receiver as well. Not much "meat" there usually, but just allowing this area to remain untouched doesn't make sense to me. He's not bedding the entire receiver, just the recoil lug area back to the mag recess- and letting the action area "float".
The point about not using the action bolts or clamps is a good one. I use surgical tubing.
I'm with you, never bedded any portion of the barrel. And I don't see what a "balance point" would have to do with affecting harmonics.