Look at the OST art... now that's what a proper Mech looks like (though the graphics in the game are now retrospectively atrocious! Wow!). It has missile launchers and turrets and cannons. And they have many of the mechanics of Railjack! But there's also a homing missile mode where you have to line up the reticle until you hear a solid beep... then you launch a volley of missiles! At least that's all I can remember...