I agree that PP has a lot of issues and should be considered a work in progress but being interdicted because you're hostile to a power is an essential gameplay mechanic, especially in their territory.
I've been in Sol destroying Federal Logistics since thursday and I've seen 4 CMDRs. Not one of them was with Hudson. The NPC interdictions can be shaken, eluded or confronted as seen fit.
I agree with laurant. Operating in enemy space isn't dangerous or challenging enough and being hostile just isn't generating enough danger at the moment.
I reckon "enemy" status should be
earned by Commanders' actions... power by power. If I've
done something that specifically kicks a Power in the nads, they should switch from "don't care" to "kill that guy".
I also reckon that aggrieved Power should back up their "kill that guy" position
by posting a big bounty on my head. Yes, that requires a degree of integration between Powers and BGS in terms of jurisdiction of said bounty. Good, I say.
So, to begin with, a newly pledged pilot hasn't annoyed any of the rival Powers. They can run gopher missions, leaflet/corruption trucking missions all day, and nobody cares... just another FedEx lackey.
But then the pilot in question goes off on a combat/privateer adventure in the name of their pledged Power. And everything changes. Each target Power will, if they get wind of these antics, put a price on the pilot's head.
Then they are an ENEMY.
Then they are in HOSTILE territory when flying through the rival Power region(s).
And bingo. Sensible, realistic mechanics, using existing Elite structure.