Describing the BionicMobileAssistant as an intrinsically broader system than the Bionic Handling Assistant misses the true weak link of the whole: modular dependency.
A mobile assistant is often just a fixed assistant mounted on a mobile platform, which means that if the mobility module fails, the entire system collapses, regardless of the dexterity of the arm.
The breaking point is not in mobility itself, but in the integration of these modules; for example, if the mobile robot's battery is empty, the arm will no longer manipulate anything, even if it is perfectly functional.
The hierarchy is not stable; it depends conditionally on the reliability of each component, not just its physical reach.