Update on this from me as a guest: this past Sunday with my cart full of groceries I spent almost 20 minutes in line and getting thru checkout with the cashier. In that time, I watched the SCOs nearby: only 2 guests went thru. 2!! They had 9 SCOs open. The guests behind me in line also had large carts and were stuck using the cashier.
If Spot is truly testing this as a way to shorten lines, they've failed spectacularly. All it has done is shift the line from SCO to the cashiers. (Oh wait, that's what they do best: rob Peter to pay Paul.....how could I forget 🙄🤦🏻♀️) I could have been in and out of SCO in 5 minutes. Way to disregard the value of my time Spot. Rude.