>>314888452
Armour has HP, Structure has HP. Once you've knocked off the plating you can then do direct damage to that point to blow off legs/arms etc or the main body to deal damage. You can hit gaps in between the armour like joints or the actual cockpit canopy and do damage straight away but it takes better aiming otherwise you end up spreading a bunch of damage onto the structure and a bunch onto the armour without really doing anything noticeable.