Such a strange wording. Sounds like you're saying "It's too simple, we need to make it more not-simple" while anyone would agree that simple is better than non-simple. What if it can be simple, useful and scalable? That's the ideal I think.
There's also the Einstein line: "Everything should be made as simple as possible, but no simpler."
I have no idea if PeerJS is actually too simple, but the "shape" of KaoruAoiShiho's statement seems fine.