For a hybridizer, it is especially important to first outcross. Second, inbreed and select for desired traits. Third, breed back into the desired population those desired traits while continually testing for the desired genes one is attempting to introduce to ensure they are not lost. This allows for new phenotypes to be developed. If a new phenotype is not developed, then there is no real point to hybridizing in my opinion. I know, there are many would disagree, but those arguments tend to go hand in hand with severely bottlenecked populations which I will not get into. The bottom line, hybridizing requires extensive work…. Just as line breeding does to stabilize a morph or a new mutation with non-hybrids. People will hybridize and people will select for traits such as color, pattern, and even temperament. If the ability to cohabit peacefully is selected for or lost is largely up to what the hybridizer or breeder finds important at that stage in his/her goals.