playing victim is a pastime here, for sure. I dont think the OP was doing that fyi, it's just a more convenient label than interdictee.
There's nothing stopping people from defending themselves against engineered threats, and certainly there are effective ways to do so.
I just dont think the non-engineered variety, even A-class, can rely on that a-class hit point and resistance to survive very long at all against an engineered player killer build.
Some amount of engineering will negate the offensive engineering of their opponent, but for some of the magic special effects there are no defensive options. Especially once shields drop. And most players who are playing without the expectation of having to duke it out with a player killing setup aren't equipping their ships to be shield tanks.
Your hull tank isn't going to counter a spectrum scrambler or pulse disruptor from their random chance at causing a module malfunction. They may still survive this malfunction, but the favor is decidedly flipped in the attackers favor with engineering. Especially if they get lucky and what malfunctions is your fsd or thrusters.
If i were to re-imagine engineering and not remove it entirely or in part, I'd do this:
Update defensive module engineering to have magic abilities that negated the magic abilities of offensive weapons. These defensive module magic abilities would be mutually exclusive with any offensive modules having the magic ability they are negating. So you couldn't use a magic feature and be immune to it. This immunity would be a direct mirror of the effectiveness of the magic ability. If it's rng, then the defense against it is equivalent rng, if it's not rng then the defense is not and it's ability is in effect until the module it's attached to hits 0. The hull, hull reinforcements, shields, shield boosters, power distributor, reactor, thrusters would all have the ability to be set with these defense magic negation abilities and they would be effective for the whole ship so long as the module exists and would not need to stack. they are absolute against the magic effect when active.
I think that would go a long way toward bringing back more balance between attacker and attackee in engineering. Without forcing the victim to have to rely on running away using the same speed mods that the attacker has available or having to shield tank hard enough to withstand a wing attack.