I think the attraction is to mount fat tires to the bike. Brake arm reach is a low hurdle to overcome. A high hurdle (true limitation) is frame clearance.

I am researching and searching for a C&V or C&V-type frame that is both lightweight and can accomodate fat tires (2.5" wide). The objective is comfort. Wheel size is unimportant but 26" is probably my minimum. Right now, I have found almost no suitable frames.