Complete and total control can be very exciting in concept for both a Domme and a sub if both are so inclined but sometimes especially sor a subbie the novelty wears soon wears off when he/she realizes there is something they still want to control.
For me as a Domme personally I think that the most important aspect of my relationship is keeping good channels of communication open.
I will always allow and even encourage feedback from my boy but I retain final say in all things.