I'm hatching Coturnix Quail not chickens and true most posts are about chickens. Hatch rates on shipped eggs will obviously be poorer. That's a given, but HOW MUCH poorer is the real question.... Everything I read lead me to believe I should be absolutely overjoyed with a 50% hatch rate and I should realistically expect less than that.
Many of the posts I have read on shipped eggs end up going south, some VERY south. Then a few pages into the thread you realize that the OP never verified the incubators temp or humidity with a calibrated thermometer.... Or that they had significant temperature fluctuations during incubation.... Or that this was their first ever hatch... Or that they opened the incubator many times during lockdown... Or that they candled eggs early on and might have accidentally discarded some viable eggs. Some posts have the chicks hatching several days early or several days late. Some have chicks being born with deformities and others die in the shell or need to be helped out of the shell... then die.
My point is the majority of what you read ends up with shipped eggs having poor hatch rates. But if you actually "read the fine print" (the entire thread) you might realize that there were other factors involved... which I think gives shipped eggs a bad rap.
I obviously don't hatch shipped eggs for a living but I consider setting 327 eggs from 5 different shipments, from 3 different states a reasonable sample size. I actually expect noticeably better hatch rates than these once I start hatching my own eggs. I will update this thread with my future hatch results...