I think medium format folders have plenty of life left in them. I've shot with them a lot, and I would strongly disagree that they should be disregarded.

My favorites are the Ikontas (regular, Mess and Super). I've not had an issue with front-cell focusing. I think it's an issue that's largely been blown out of proportion.

Aside from the Zeiss Ikon folders, you also others made by Voigtlander, Agfa, Certo, Kodak/Nagel and Kodak, Welti and countless others.

Ironically, the 6x6 medium format folders with lens beds that fold down are the easiest to use, because you generally hold them in the same way that you would hold an SLR. Place the lens bed in your left palm while holding the body with your right hand, finger on the shutter button.

For Zeiss Ikon, 6x4.5 and 6x9 will require a slightly different grip.

All with the Zeiss Ikon Super Ikonta 530/2 (1937):

Ektachrome 100

The downside of this camera is that you must mentally adjust for parallax, which I didn't do and cut off the ears of the hobby horse.

Agfapan APX 100:

Arista 400:

I think I shot this at about f/8, maybe 1/50 of a second.