Excellent Post. Excellent!!!A fundamental difference between audio and photography is that a lens and camera are part of the creative process, I guess it's similar to the fact that amplifiers and speakers for electric guitars which are also part of the creative process are very different than those designed for music playback. So flaws are what they are, people may like some 'character' (i.e. flaws) in a lens and use it creatively.
I think it is easy to get too focused on measurements, where optics and sensors have something in common with audio is that at a certain point measured performance basically just because a matter of bragging rights and marketing, and indeed becomes another form of subjectivism. I struggle to remember a lens I've used that didn't have the sharpness, resolving power etc to produce perfectly good images if used correctly. And some of those that need some care are the result of clear compromises which the manufacturers don't hide, such as ultra-wide aperture designs which trade off against getting the maximum aperture right down.
And that is without considering that performance is not the only reason people like things. I'll straight up say my interest in old camera gear is about the tactile feel and the mechanical precision, I'm perfectly happy with my mirrorless camera and mobile phone in terms of photographic tools. I love the feel of nice MF lenses and of mechanical cameras.