Right, but what’s the value which isn’t also found in the picker?

I can't think of any. Again.

If you want to sit back and relax while the work gets done, as posited earlier, why is that not true for the entire process?

I'm not saying it's not true. If the local supermarket decides to provide that service at no extra cost, I'll use it. And even when it's not free, sometimes I use it (grocery delivery).