You're right about the docs, and we'll fix it we fixed it.
As for the timing, unfortunately the entire Internet is under attack, including many Tailscale exploitable vulnerabilities and there just wasn't the normal amount of time available that normal "unshipping" a feature would take.
We would loved to have given you a 30 day warning that we were going to remove a potential security vulnerability, but...we did not believe that was an available option.

