A lot of people don't agree with hybridizing animals, no matter what species they are. They believe its "playing god" or something similar. There are probably other reasons as well.

Personally I'm on the fence about it. On one side I see no problem breeding two snakes with desired traits together as long as it is done responsibly, but on the other I see it as would these snakes breed in the wild? Probably not. So I'm still undecided.

As far as deformities and problems, there is always the risk, but I'm not sure what others have found when breeding these two species together. I'm not sure if its even been done.