It all depends on what turns you on about the hobby. Different people may do the same activity in different ways. As far as building models, some people are always pushing themselves to get to that "next level," they sweat the details, they do everything they can possibly do to make their model as close to perfect as possible.
Then there are those who get their hobby kicks by simply gluing together a kit and putting it on display. To some builders accuracy and attention to detail never even enter the picture... it's just not part of the hobby the way they enjoy it.
So debating about whether or not "perfectionism" is a worthy goal or trait is pointless.
To perfectionists, yes, it is. To others, they couldn't care less.
Different strokes, as they say...