I sorta get this - but it's not for me. I'm an adder.
While I appreciate aesthetic subtraction as an idea, I get bored. I need to 'add' to avoid that. I can get bored half-way through a roll of 36 and want to use another type of film. Sometimes I want to shoot a model in colour, sometimes in mono. Depends on the model and the set. I agree that Dicky Avedon did tremendous portraits in front of a white background - that was his Big Idea - but I dont want to limit myself to copying his aesthetic. Nudes look best in B&W, don't they? But I have a shoot lined up where the model is going to wear gold leaf as body art. So that will need to be in colour.
I think the decision process in image creation is an important part of how I snap. Using a 35mm prime lens & 135 HP5 for everything would eliminate many of the options in my tool box. So when planning for the gold shoot, I will decide if I want to shoot 135 and blast away, hoping that 1 will come out, or if I should use MF and coax each shot out of the model. Will I have time to do a few Polaroids as well? Would that increase the chance of creating a keeper, or interrupt the workflow?
If I had to give all my cameras away to friends, I could manage with the R8 and 2 lenses. (Am I the only FW on here who admits to having more cameras than friends?) I'd be happy with the R8. I'll never part with it. But I would battle. It would (nearly) always have the wrong film in it. Or it would be too heavy. Or I'd want a square MF. And I'd miss the Polaroids. So be subtracting all the other gear, I'd be subtracting opportunities, too. And adding heartache about how I would like to have taken the shot with another rig, using another film, on another day, with different light, perhaps with a different model.
Where I to become a monk, I think I would try to subtract. But then few monks shoot models liberally rolled in gold leaf. So put me down as an adder.