when I go to the grocery store.
You have time to go to the grocery store, you are not the target market - someone sunning themselves in Barts is.
If I were rich I'd buy three.
These are not "labour saving devices", they just reduce the
time people spend currently thinking about a machine and
accommodating its current limitations.
Look at the current Tesla, you press a button and it drives over to where you are standing, it unlocks the door and opens it for you, you sit down and it closes the door for you, then it drives you home. That's removing all the small things you once had to do because the machine wasn't intelligent enough to do them for you.
It's just replicating the role of valet or chauffeur staff.
Domestic androids won't simply be ironing our clothes, they will be turning down our bedsheets and picking up our socks.