I find this a pretty interesting topic. However, Giga hit it on the NOSE by stating "It's all about figuring out what's best for an individual snake."
I've had snakes that have no problem eating while in blue and others who will hide and don't wanna be bothered while in that phase, but almost ALL of my corn snakes have eaten if offered food while they were in blue. I was ignorant of the dangers just a little over a year ago, prior to finding this website, actually. Now, after reading about it, I would rather wait a few days rather than take a chance on a regurge, no matter how small the chance.
About 2 years ago, when I placed all of my adult corns in their feeding tubs, I gave a rat (almost 70 grams) to my largest corn, Bozo, who can get up to 950 grams and is about 5' long. Since he is a snow with red eyes, I can almost NEVER even TELL when he's ready to shed. He eagerly disposed of the rat and after swallowing it besides for looking a little thicker than he already IS around his lower half, you couldn't really TELL that he had eaten by just looking at him! But as I was going to pick him up to place him back in his enclosure, I noticed that he started to rub his snout against the edge of the tub where the cover snaps onto. He kept rubbing his snout like they sometimes do after eating and I initially thought nothing of it, UNTIL. . . I saw a little flap of skin peeling off of his snout by his mouth and first thought it was just a piece of skin which had peeled off due to the relatively large rat he had just swallowed, like maybe a loose scale (not that I had ever SEEN that before, but it looked almost typical, the way he did it!)? But as I looked closer, the flap kept peeling further and further back! Then, after one more rub, the flap turned into what was the beginning of a SHED!! I saw the flap get pulled FURTHER AND FURTHER BACK AS HE RUBBED ON THE TUB!! After peeling back past his neck, he just seemed to slowly shimmy his way slowly out of the rest! It wasn't until he was just about DONE that I regretted NOT filming that whole process with my cellphone!!! (I actually caught one of my other adult corns, Chili-Pepper, my motley bloodred, shedding, but only caught the last half of the shed on film, but it was cool enough to upload to YouTube anyway!!).
In any event, maybe Bozo shed BEFORE his digestive process had really begun by shedding IMMEDIATELY after eating a large meal which was probably going to take quite some time to digest? For whatever reason, it WAS one of the coolest things I EVER witnessed one of my snakes doing!!