Is it correct to say that picture quality is better with small f number, but with very small DOF, this perfect quality degrades very quickly?
So, is there any reason to shoot with wider aperture except to separate foreground and background? (In theory — don't worry about shutter speed and blur with narrower aperture, etc.) The question is about picture quality in perfect focus with different aperture.
Assuming we have ideal post-processing software which can separate each object from background, we can easily programmatically blur background and get same quality image. Why bother with wider aperture?