Do most people view being a perfectionist a good thing? I certainly don't, most perfectionist are annoying and slow to accomplish tasks. I put way more stock in getting it done than getting it perfect as long as things are getting done well. I think you learn a lot more when you can accept mistakes and imperfection and then repeat a task to learn from another round of mistakes. Only after being completely bollucks a bunch should you take a run at perfection.
Perhaps because perfectionism is often seen as the direct antithesis to mediocrity. "Surely being perpetually unsatisfied and constantly striving for more improvement, is better than settling for a state that's below excellence!" But of course it's best to learn the fundamentals before heading for the peak. Whether that be from your own mistakes or from others.