Heavy Fighter Technology

Outside of the MKW game (where the GM/judge has ruled that human heavy
fighters use screen technology), how many people feel that human heavy
fighters use screens and how many thought they were just tougher (like
armoured hull, etc.) ?

Just curious. I have, in the past, treated heavy fighters as if they
were
heavier construction, not screened (for purposes of judging
vulnerability to
enemy weapons, etc.)