I do not really understand your point.
Pirates still attack you. Not just in Anarchy systems, but also in established Imperial and Federal systems.
Like Zergling already mentioned... do not forget about the interdictions.
In my T9 I get interdicted on a regular basis and that is great fun.
I just obliterated a wing of overconfident Sidewinder pirates.
If they had attacked me a few days earlier I would have had to flee, but my newly fitted beam turrets and other defensive modules performed admirably.
I just know that I have been doing the silk road in my Cobra with 32T of cargo, and rarely if ever get interdicted. And when I do, I can jump back out if I submit and rejump. The "no penalty" for submitting to an interdiction basically nullifys the need to fight interdiction at all.
If I fight interdiction and win. I escape.
If I don't fight interdiction and submit, I only have to wait 5 seconds until I can jump again.
If I fight interdiction and lose, I am in a world of hurt.
This makes the risk/reward for fighting interdiction too high. If I submit, I can easily jump back quickly, and it's basically an automatic win. If I fight, and win, bully for me, BUT if I fight interdiction and lose, I am at a REAL big disadvantage, especially towards a well armed opponent. Makes more sense to submit, see who I'm up against and if he's too big, then turn tail and run.
For me, if I submit to interdiction it's the same as surrender, and I should have the same FSD penalty as if I fought and lost. In any case, I lost both times, either voluntarily or involuntarily.
My mindset after submission should be
A. Let's rumble, I'm not scared of you
B. Here, have my cargo, please don't hurt me.
Point is, most people can submit and can boost about for the short time it takes to re-jump. This is especially true if you have some shield boosters you can drop while your drive is charging.
A trader can effectively trade ANYWHERE without mounting a single weapon and that just doesn't seem right. How many times have you flown into an Anarchy system, approach a Pirate outpost, that's displaying a skull and crossbones, for crying out loud, and no one looks at you twice? What type of pirates are these?
Perhaps T9's and bigger craft get interdicted more, but my experience is that if I trade, I rarely get pulled into a fight, even in an anarchy system. In the original Elite trading in an anarchy was like having to fly through a RES to get to the station. You can be there was at least one guy who was gonna fight you and often times you had to defeat 3 to 5 guys before you hit station space. It made trading in an anarchy both exciting, rewarding (anarchy's always had the best prices). Now trading in an anarchy is 'meh' It's not particularly dangerous and there is no buff for trading in a lawless system. In fact the only thing an anarchy is good for is for the player to pirate other players or NPC's since your own crimes aren't reported. It just seems in Elite Dangerous, most NPC pirates hang out in a RES just serving themselves up to patrol craft or RES farmers like me....