It's honestly too simple, more work has to be done to get it to be actually useful and scalable.
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.
Simple would be a real application not subject to the constant churn and complexity of corporate driven web.