I think it's far more plausible for sufficient damage to the hull/structure cause the ship to break apart than it is for the destruction of the ship's fusion reactor to do this.
Damage from a magnet quench and the resulting loss of containment really wouldn't be very catastrophic with any real or speculative fusion reactor design and that it even has a chance to totally destroy the ship in and of itself is almost pure fantasy. The power distributor module and ammunition magazines both likely have more energy to be liberated than the power plant itself. Then again, the power plant likely contains/controls the coolant system and destroying that would probably be as good a reason as any for the auto-ejection and scuttling mechanism to trigger.
Regardless, I don't see this change as being any better gameplay or plausibility wise and I'm not really in favor of it.
As noted above, this is false.
Targeting a subsystem is only an aiming guide. Weapons hit whatever they hit, with penetration depths based on the weapon and the ship in question. You can disable your sensors entirely and use a fixed weapon to core out any module you so choose, if you know where they are and can land the shots. Conversely, you can have a module targeted, and be aiming directly at it, but not do any damage to it, while destroying other modules that are blocking the path to it.
Damage from a magnet quench and the resulting loss of containment really wouldn't be very catastrophic with any real or speculative fusion reactor design and that it even has a chance to totally destroy the ship in and of itself is almost pure fantasy. The power distributor module and ammunition magazines both likely have more energy to be liberated than the power plant itself. Then again, the power plant likely contains/controls the coolant system and destroying that would probably be as good a reason as any for the auto-ejection and scuttling mechanism to trigger.
Regardless, I don't see this change as being any better gameplay or plausibility wise and I'm not really in favor of it.
in Elite's system, you only hit a subsystem if you target it
As noted above, this is false.
Targeting a subsystem is only an aiming guide. Weapons hit whatever they hit, with penetration depths based on the weapon and the ship in question. You can disable your sensors entirely and use a fixed weapon to core out any module you so choose, if you know where they are and can land the shots. Conversely, you can have a module targeted, and be aiming directly at it, but not do any damage to it, while destroying other modules that are blocking the path to it.