I see P2P working 80%+ of the time for my deployments. Other people have posted data about this also https://medium.com/the-making-of-appear-in/the-most-likely-t...
P2P is better then TURN/Iroh Relay. Even if traffic is encrypted the size of what you are passing through is valuable metadata. Or the time at what you send things. P2P is always better for users.
Of course P2P is better, my point was that it doesn't work in the browser most of the times, and your link seems to corroborate it.