Really? You mean like traditional MF systems like the Pentax 645, Pentax 67, Mamiya TLRs, Mamiya 6 and 7 Rangefinders, Rollie TLRs, Fuji rangefinders, etc. None of which are open. Besides, for my 645D, I can buy a very cheap film body if I need to use film. And then I would have two camera systems rather than one which did two things. Mamiya/Phase "open systems" do not take film backs anymore.
And as far as "insane" upgrade costs, if upgrades are even really needed, there is no proof that an open system is cheaper. I am already ahead of the game by buying a Pentax 645D--an "open system" would have cost me another $7,000 and then another $20,000 grand to upgrade to a touch screen if such things were needed. Very economical.
If you like an open system, that is fine. But I think we can stick to some facts for the OP rather than invent stuff.
1.No! I mean like Hass V, Rollei 6000, HY6, SL66, Bronica ETRS, SQA, GS, Mamiya RB, RZ, 645, Contax 645, ...you name it, more than 80% of the market!
My Contax 645 system consists of 3 bodies, all viewfinders, screens, ext. rings, 5 backs, 7 inserts (2 suction), all 8 dedicated lenses but the 350, 4 more via an adapter and an Imacon 528c multishot 4x and microstep 16x DB. The whole system has cost me about 14000, that is....for 3xC645 with 11 Zeiss and an Arsat 30 f/e with 4X and 16X! ....Q.E.D. If I was to buy the same system in closed Hass H with MS (H3D39MS), I would need more than 50000 more in the S/H market (that to me is insane) and with lesser glass and no film! The only other solution was the open Mamiya 645 but at similar cost with lesser (dedicated) glass and no WL finder, an alternative would also be Hass V but without AF. By the way Mamiya doesn't make the FB anymore for no other reason than cost. They just don't have enough customers for FBs to justify production. Cheers Theodoros
www.fotometria.gr P.S.Mind you that the original kit, the second body and 2 more lenses were bought new (NOS) starting 5 years ago.