Minority rule will discourage the kind of content that you posit new readers prefer and old readers dislike. If new readers need to sit through hard tech articles for a period before they can influence content, this will keep away new readers that don't like hard tech articles. They won't be able to simply reshape the community to their preferences instantly.

Imagine a 30-day waiting period between joining the site and being able to influence content. You won't stick around unless you like what is already there.