WebRTC requires the use of a centralised signalling server for the initial connection between two peers. I feel many miss this point when reading about WebRTC-enabled projects. Even if you do have Universal Plug and Play which port forwards automatically (and thus you can communicate directly between two peers), you still need this centralised signalling server.

Correct me if I'm wrong, but this poses a problem if you ever want to take WebRTC further (i.e. in a self-hosted mesh network).