Probably the people being interviewed can be more candid to a stranger compared to a family member/someone they know, and a professional interviewer would know better what to ask to get a good story out of them...
Hey - So we shared that same concern when we started doing the first interviews and edits with friends and family.
The feedback we received then and continue to receive from customers is that people are using our service to record what you might call "archival conversations". These are conversations about important questions, events, or people that you, and your friends and family may want to listen to again in the future - or later share with new friends and family (children and grandchildren) along the way.
I'd also say that we are finding that there is some kind of magic that happens when we bring together a professional interviewer with someone to talk about important things. The candor and depth in that session is something that continues to surprise us and our customers.
All of that said, I really appreciate your direct question about a potential weakness in what we creating.
Isn't this just a suboptimal substitute for a conversation?