> I mean, do I seriously lack the time and/or willpower to go to the store and pick up my own groceries?

I think it's more for refilling things you commonly use without needing to worry about them. I can't tell you how many times I've forgotten things like detergent when we were low or out but pressing a button when I notice it's out right after I use it? That's really low friction. It's not a half bad idea in my opinion.