Personally I think most of the obsession comes at the "f/64" end of the scale.

One of the great joys for me in using a Holga on occasion is that it adds some personality to the generic snaps I take of life around me. Sure my F5 with a 50mm f/1.8 can get me a sharper, better focused, better exposed, shot; so what, the Holga shots have great character. Center the subject, get close on focus, use a forgiving film and I get a negative that naturally focuses the attention in a print on the subject.

Old Petzvals do the same thing on LF cameras.

To me the quest for edge to edge perfection is distracting. I think this is one of the things that bothers me most about most of Ansel Adams work and digital.