When I first had an interest in breeding BPs, I looked into this topic as well. I asked a lot of other breeders if they do or don't cut eggs. I found a few different reasons people cut and those who don't. Some said "Let nature take its course". My thought was, How are you "letting nature take its course" unless you're maternally incubating. Most breeders I found remove the eggs. Put them in an incubator and control everything. I feel if I'm going to control all of this, I'm responsible for making sure the hatchlings have every opportunity to hatch successfully. I came to my decision to cut eggs only after I've found a hatchling pip or slice its own egg. I make a nice flap, check that the hatchling is moving and not twisted up. I have found and corrected 2 hatchlings twisted in their umbilicus. Half the time I can't even tell what the morph is at the time. They tend to make their way out within the next couple days.