It would be nice to be able to destroy the visual visor of a robot in a targeted way and then orientate itself only by means of noises (shots / explosions, loud running). Robots with destroyed optics should move more cautiously and shoot in the direction from which they suspect the opponent.
Also some Seeker should have the option to Mark you with a laser, and then this location gets attacked by the tanks and Harvesters by its Mortar, even they don’t see you directly.