just came back on the forums, haven't played the game since dec, just started back again to check on it.
FSD cooldown after submission has always been that way.
You can either fight the interdiction, or just submit and bug out at the risk of finding out what your pursuer is packing.
Obviously if it is an anaconda the mass lock will slow this down. You will not be in emergency cooldown, just standard FSD cooldown.
Most people never find this out because they just alt-f4 their game out the moment they are in danger, I even know folks that brag about how they alt-f4'd some guy and I can merely roll my eyes at how they are simply bragging about cheating because a simple pvp mechanic is too scary for them.
...mini rant aside, it is also really nice to be able to get interdicted by a pirate, suffer no damage, have the ability to escape and yet earn a nice bounty instead before I make my merry way back on course.
Oh ..and he dropped some stuff, I'll just be scooping that up...on my way with some ..other illicit items anyways.
This is also faster to pull over when the cops come by for an inspection, immediately recharge FSD, and be out by the time they are done scanning. Generally a player could still be in the interdiction mini-game by the time they could have been on their way if the pulled over.