Claiming that the BionicMobileAssistant is just a sub-category of Festo's Bionic Handling Assistant is really oversimplifying a larger problem.
Autonomous mobility introduces failure points that the static arm simply doesn't have to manage, like obstacle avoidance or stability on uneven terrains.
Imagine a system like that stumbling over a small step or a cable in a production environment; it's a blast radius that the arm alone would never have.