Pretty much it. Nobody of us cared about the "danger" a single Lynx posed obviously. For myself, what annoying was the (in my view) pure trollish attempt to annoy other players. Especially since we usually took every "new" player that showed in pirate faction chat and helped them at the start (questions answered, help with the first capture and so on).
Why pure trollish? Because a lynx that fires "broadsides" upon a constellation and two other frigs is nothing else and has nothing to do with "that's how pirates behaved in real life". If I am not completely mistaken, not being able to attack ships of that size in a lone lynx is one of the "gameplay features" stated in the naval faction open world FAQ.
I think Lynx vs 3 Frigs is pretty much the same. Especially since it can't outmaneuver 3 at once.
Additionally, nobody would have said anything if the lynx would have tagged us in open world and attacked (as you can do). If friendly fire IS intended for pirates WITHIN battles, at least boarding should be enabled so that a ship that is parking right next to you can be boarded.