If a tool is keeping you from getting the job done, get rid of it.
The few times that I have been bit on this its been because I didn't do a good job before the shoot of explaining what I provide, really showing my style and my prints.
The clients were simply in the market for a product I didn't offer and I didn't spot that problem in time, I was too hungry for the sale.
The question is really are you willing to adjust to get the MF advantages.
It is my understanding that Jose Villa actually uses both the Contax and 35mm. The 35mm for the faster candid work, the Contax for (my words here) the money shots.
Jose will actually direct the action when needed for the money shots.
This isn't the classic formals by any stretch nor is it the normal PJ style so many shoot today. If the couple does something fun that he couldn't get, he'll have them do it again.
His direction also comes in the form of nudging clients into situations that give him the shots he sold them.
Because he is willing direct when needed, he's not in so much of a rush and can keep his shot count down and still get exactly the what he needs to get on MF.