We lack the NPC blockade, but apart from that you describe a "private group" and open in general.
To my understanding, reducing the means to interact with players is robbing the galaxy of diversity,
but that is a personal opinion.
Of course there are solo players, and players who go on a spin with their friends only,
yet open....
In the end one of the playstyles takes the stick,
and i rather think that is piracy.
No matter how enthusiastic someone is to be interdicted by a pirate,
dance a bit and drop some booty in the end,
after several insurance screens that is gonna change a lot.
Or he simply checks in with friends and takes the joy-ride,
leaving piracy as a means of player interaction to die out.
You are probably right, but it's hard to see how being a 'victim' of piracy, even good piracy that doesn't involve an insurance screen, is likely to be rewarding gameplay in the long term.
It's a game, it needs to be fun for all involved, and while a good RP encounter will be fun for those looking for good RP, even then it isn't likely to be fun when it continues time and time again with the same result.
I'm certainly not having a go at pirates and players wanting to be pirates, just completely unable to see how it can be sustainable in the long term, unless you have a constant supply of 'fresh' targets, all of whom are looking for a few fun RP sessions.