> they just have to be good enough on a narrow set of tasks to be worth the trouble

Depends on the context. If they are to work around human beings, particularly in the home, then they must be safe... to work around humans.

If a humanoid robot hits a human being, knocks one over, or even falls down on top of one -- especially a child, who is more fragile and whose movements are unpredictable -- then the industry as a whole faces a huge setback. Just look at what happened when a "self-driving" Uber ran over and killed a pedestrian in Arizona.