Production

I just finished the ten books I'm bringing as gifts to my book group Christmas get together.  I probably wasn't as careful with them as I was with the batch of BCD books I made, but they're passable, bordering on nice.  It makes me think about perfection .  My initial thought is that mass production excludes perfection.  This isn't what I've been taught.  The assembly line provides, in a sense, mastery, at each stage.  So, then, was it because my project involved so many jobs that I did none of them with precision?  Multiplicity in tasks produces boredom, followed by disinterest, followed by deterioration of the product?