I was asking why there is not (or at least not that I've found) a summary of the state of play in a prominent place.
I could have read through several hundred issues to determine that I'd run into some rough edges with these bridges and that perhaps I should come back later. Instead I find these rough edges when I dive-in, and now I wonder what other shortcomings are not being mentioned with the same gusto as the projects wins.
The main Persona project: https://github.com/mozilla/persona
The Gmail bridge: https://github.com/mozilla/persona-gmail-bridge
The Yahoo bridge: https://github.com/mozilla/persona-yahoo-bridge
(I'm not affiliated with the project, just a long-time user.)