I've found none of the arguments around egg whites to be very convincing, other than one potentially which suggested that fertilizing the egg makes all the difference in its digestibility. I havn't decided that to be personally true, howver even with quality unfertilized pasture eggs, any difficulties I have as far as digestive or eliminative ills tend to go away in time. Although wild eggs would clearly be superior, and there is some tampering with the life cycle as suggested, I think the habituation excuse as to why some might not do well/poorly with eggs is really dodgy. People have used this argument over and over to talk about all animal foods, that people are too toxic and therefore need meats etc...You can take someone is excellent health who hasn't had eggs in years and is all raw, and someone in poor health and there is probably no greater percentage that the eggless healthy person would have a reaction similar to cooked eggs and that the person in poor health will feel well. Its possible eggs in general are just mediocre nutrition, but I don't think this has do with with partially grain fed birds, who with access to pasture and insects, estimates a fairly natural diet for a bird that has been bread far from its wild counterparts.
it hypothesized my many that eggs pull toxins from the body and are particularly in regards to the liver. This could be totally wrong, but a true test in this case would be to eat a large quantity of wild eggs. I suspect in most cases the wild eggs will be even more volatile as the bacteria in the egg seems to be a major culprit in most symptoms, rather than its toxicity or digestibility. This is just my opinion and I have not done any tests myself.