Right, and the bubbles get ABSORBED into the liquid of the egg, then the gas can move out of the egg, or through the membrane. If oxygen could not move through the shell/egg, the chick would die of suffocation (lack of oxygen) or Co2 poisoning. And as I said before, the membrane can heal a rupture, IF it is a small one, and IF it is not moved for the first couple of days of incubation. Basically the eggs that get shipped will have some damage regardless of how well they are packed. It is amazing to me that they do recover enough from shipping to hatch at all. All I can say is, I used to hold them for 12 hours and then proceed as per usual. Since I started using the "no turn for 48 hours rule", my hatch rate on shipped eggs has doubled. And since I started recommending it to my egg customers, THEIR hatch rates have improved tremendously as well. I may not know the entire science behind it, but I can tell you it does work.
As for eggs from barn to house, I only hold them as long as I need to to set the hatch for a specific day. Or for a specific amount from a particular pen. I agree that eggs for incubation at HOME need to go into the incubator asap. In fact, I just put my first turkey egg of the season into one of my incubators... and it was still warm from laying