I strive for excellence in efficiency but I only let myself really get fussy when I'm refining a physical surface. I learned a lot from observing tool marks, so I like to remove mine, and make my stuff "look like it sprang from the head of Zeus." A chunk of brass goes through various dirty and ugly phases, but then, when it is free of all scratches, it kind of disappears and only reflects an image of the things around it. That's when it feels perfected to me. When making fiberglass molds, a good polish can more than double the lifetime. Once the surface is shiny, you can then go for optical perfection, but I try to avoid that, too, just getting close enough that only experts in a location with a grid reflecting will see the problems. In the auto-body trade, we hear "Hey, nobody gonna look at both sides at the same time!"
Math, of course, has perfect answers, and simple programs can do exactly what I want.