I had several classical folding camdras, including Zeiss Super Ikonta and Voigtlander Bessa Ii. I snjoy them very much.
There is A weakness inthe folding structure that my Kodak Medalist II outperforms them significantly. Yes, partly also due to the lens construction, since I can control the Medalist to match the focus, and confirm the lens quality but in real usage, it is the focusing error and the lens to film squareness that causing the major difference.
Nevertheless, they work fine with me since i used them mostly for landscape, especially when putting on tripod, and set to small aperture and infinite distance. yss, the advantage of the portability of folding camera was lost.
Moving into digital changes the equation. I have given up Fujifilm GX680 on any digital usage. Even with 22mp digital back, it requires geared focusing system to appreaciate the digital image.
In reponse to the digital medkum format rangefinder camera announcement, I doubt if any folding structure makes a
ny sense.