There are other types of efficiency than time. At my supermarket, they replaced 2 regular checkouts with 8 self-checkouts in the same floor space. During rush

There are other types of efficiency than time. At my supermarket, they replaced 2 regular checkouts with 8 self-checkouts in the same floor space. During rush hour, this greatly increases throughput despite actual scanning time perhaps being slower. At McDonalds, it means they can higher fewer staff which means a cost efficiency.