Interviews can be very factual and informative, and the person behind can seem pretty irrelevant. The interview is often just one of several parts in a journalistic story. Fortunately, the categories overlap each other.
But I really like stories, where the main thing actually is the conversation, the encounter, the story that this particular person can tell. My thesis is, that everybody is interested in other people, even if they don't know it. That's why stories that are able to show a person in a credible way, always are enjoyable to read. That's true, even when it's some other subject, that really is the reason for the whole story - typically some area, where the person in question has some special knowledge or experience.
In short: Interviews are a chance of telling a unique story. It occurs to me as a trade of journalism, that's very, very interesting – and difficult.