I just don’t think purely population based curation is coming up with the best content selection.
Ergo, you don’t trust that users are able to curate as well as an individual, despite the fact that the individual is just one of many users.
Just because you didn’t use the word “trust” doesn’t mean you’re not describing not trusting that you’ll get the best curated content from a large group of users as opposed to a small group. It’s literally exactly what you’re describing, that you don’t trust you’ll get the best results from a group.