Do you mean the waistband simply being cut in two parts (which makes alteration of the waist/seat easier), or do you mean a V-split where it is left partially open at the top?
Either way, I do not see any reason it should split open any easier.
I mean a V-split where is left partially open at the top. It is without belt loop and I normally wear without suspender. Maybe the joint of V-split is not strong enough?