One format or one ratio really does not suit all conditions universally.
That means no one camera is suitable for every situation you come across.
I have used 35mm (2:3) for many years, latterly hooking up with 6x6 and 6x7 (6:7), also 6x17cm. None of these is a favourite, but 35mm was all I wanted to use for a long time. Each has a specific purpose e.g. 35mm for bushwalking, 6x7 for very large prints without cropping, 6x6 pinhole often used on bushwalks.

I think as photographers there is a format to suit just about everything we can think of without adding further complexity to the craft.