Right now, nothing is fundamentally broken, unless you're working from the principal that a game should be about a relative measure of skills, rather than about one team learning a simple trick that works every time and that's the end of the game.
So once the submission is taken, both ships are now in free space in a confrontation, where the pirate should have the upperhand (ship, intent) and the trader has no advantage over the pirate at all other than the same ability to use his ship? right?
I get that the submission means the mini game is avoided, but the trader loses to an equal situation with the pirate - if they were in idenical ships and of equal skills you could say its now a fair fight, correct?
Isn't the result of sbmission to the interdiction just the same as you waiting in free space outside a station no fire zone and trying to pirate? it's you and me, nothing but our ships, skills and intentions, or am I missing something (and I might be I am genunely trying to work through this) is the FSD cooldown now different for pirate and trader, the traders is shorter than the pirates (as far as I know its shorter than normal, has nothing to do with FSD or FSI, but I assumed it was the same for both parties). Even if it is shorter you, the pirate have the same (should be better, you are the pirate in the superior ship) 'boost boost' time to bring guns to bear and hurt the trader. That 'cooldown; if not equal probably does need some fine tuning but IMHO it would have to be variable and based on the delta between ships, else its just another fixed fudge of a game mechanic that will see-saw one way and the other based on whichever dev feels what ever sympathy towards whichever play style on that day.
Interdiction is a mechanic that should give some 'chance' to pull a ship out of SC, thereby rendering SC not a safe place to go and get a coffee - that, I thought, was the intention. It's not supposed to be a mechanic that is designed to stack the odds in favour of the pirate rather its just there to enable the chance of piracy. It does seem as though its the ONLY place piracy occurs though and I think that speaks volumes for how broken piracy actually is
It is obvious that the current design is not meeting everyones requirements, but I don't think its anywhere near as broken as some people are suggesting (and I think there are plenty of broken things in ED)