Here's my experience . . .
I've always been into view camera photography for medium format roll film and 4x5/8x10 sheet film. Along the way in this lifelong venture, I was lucky enough to pick up an Arca Swiss Metric, 6x9 camera for less than $7C. I previously had a Classic F (non-Metric) camera, so I had a variety of Arca accessories and medium format lenses.
My digital system consisted of a 35mm SLR that I used primarily with perspective control (lenses with movements) lenses. Being 35mm, it was of course 2x3, and I BLOODY WELL HATE this aspect ration compositionally and because, for me, it was such a waste of sensor real estate. (I prefer the 3x4 or 4x5 aspect rations.) So, I was very susceptible the the digital MF bug.
I finally took the plunge about three years ago and purchased a used Phase One P45+ "H" adapter digital back for use with my MF film camera equipment. ($5K from Digital Transitions.) I wasn't wild about the "H" adapter on this back. But the back was refurbished at the Phase One factory itself, and it had less than 2500 shutter clicks. So for all practical purposes, it was a "new" back.
There were some additional purchases needed to make this work. I bought an Arca Swiss "N," "H" adapter and an "N" ground glass for my Metric camera from Rod Kuklas. I had both the 47mm and 58mm Super Angulon XL film lense, and a 75mm Super Angulon f5.6 lens, but needed something wider. I snapped up a used Rodenstock 35mm f4.5 Apo Grandagon lens from BHPhotoVideo for $1K. It's an amazing lens that actually covers 6x9 the 6x9 film format. I've since updated my 100mm, 120mm, 150mm, and 180mm focal lengths to Apo Symmar lenses.
In this kit, it's fairly obvious that all my lenses are designed for film. But with these and a few roll-film backs, I can readily photograph in color using the digital back or photograph in black and white using film. This is optimum for me. And I wonder, for my purposes, is there really that much difference between these and digital lenses? (Open to feedback on this question.) A professional, architectural photographer friend of mine did some captures together using the 35mm Apo Grandagon, and he saw very little chromatic aberration, and what little existed, was easily corrected.
I like architectural, landscape, and fine art photography, and I don't think that I miss much not having a technical camera. My Arca Swiss Metric camera (with a ground glass) has plenty focusing precision for this kind of photography. Even the Arca Swiss M2 camera designed for digital has the same focusing pitch as my camera. Besides, I'm more of an enthusiast(ic), versus a professional, photographer. At most, I enlarge to 16x20 photographs, and 39mp is sufficient resolution for that purpose. Although I might admit to living a bit in a state of ignorance with my equipment, I'm none the less, a happy camper.