I have an RB67, a Pentax 67II, a Fuji GW690III, and a Bronica SQ-Ai for my MF collection. I don't make nearly as much use of them as I should.

That said, the RB67 seems like a studio camera to me, or a "very close to the car" camera. The Pentax 67II is also a lot to carry around. The Fuji is my most portable MF camera since it does not have interchangeable lenses, and the images it produces rival large format. The Bronica was purchased as an admission that I'm just not going to carry around the Mamiya nor the Pentax.

Yes, MF can be spectacular. But I still love my 35mm rangefinders.