I think it would be an interesting feature if when a robot or titan reaches a low amount of health, in addition to damaging its legs and perhaps losing a weapon, the ability of a certain robot would be disabled or not work properly.
This already happens with the Pathfinder ability: Enfeeble, although I think it's actually a game error, but I still think it's a striking feature. Adding something like... the Imugi being able to continue flying from Point A to Point B but losing the ability to generate portals, or the Teth losing the ability to regenerate its physical shield and apply EMP
Other quick examples would be the Raptor's Magnet being disabled, the Sword Unit's integrated weapon being destroyed and therefore no longer working (Or even its sword haha) etc.