The key point, which perfectionists miss or more likely just don't agree with, is about being less wrong. WP is time and again show to be less wrong than supposedly trusted or more formal resources.

When it started many people would look to the Encyclopedia Britannica as more reliable yet research showed that on average it contained more errors and that's with the occasional inexperienced/ rogue editor on the WP side.

EDIT: fixed my own typo! (relatable -> reliable)