Newbies or Better information?

I'm a newbie but very interested in these topics. For me quality increases through the diversity, accuracy, depth and engaging style of articles. Diversity is well served by newcomers, though they may not provide the accuracy, depth or engagement more experienced users do. I recently read about the diverse roles played by Wikipedians, and related to how each user takes on different roles. It seems that roles evolve too, and the role of a new user is to stir things up, inject new ideas, whereas an experienced user may spend more time refining, editing, mentoring and deleting. I imagine our goal would be to find ways of encouraging all users to adopt/retain the qualities of those at the other end of the experience spectrum so we can keep all aspects of quality high.