If you've ever looked at your pinhole through a microscope, you've probably seen just how excessive the concern about "optimal" can be. Getting the hole to be clean and free of metal junk when it is new is a real challenge, and keeping it clean afterward isn't much easier. You could have a "perfect" pinhole and still get very disappointing results.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh