"Because you are breaking up, unnecessarily, an intact household. No cohesiveness, no full family. "
Unnecessarily in whose eyes? The father currently has the children 130 days out of the year... 35+% of the children's lives is spent with their dad. The OP is suggesting to bring it down to 24+%... a 10% drop in time with dad. Sorry, but in my opinion, time with dad trumps time with sdad, or her time with her dh. At a current time share of 35+%, I would certainly call this guy an involved father, no? Unless there are reasons not mentioned... for the average situation your statement is an insult to the father. "full family"?? What is the father, a stranger?