To design is shop is not about math or throughput, it's all about psychology. You don't want lines to move fast, you just want them to appear like moving fast.
My point is merely that self-checkout is not only about speed, it's about personal comfort too.
No, I was referring to me being down-voted, for my snarky comment.
"""My point is merely that self-checkout is not only about speed, it's about personal comfort too."""
Sure, could be, but the particular "irritations" you mentioned I see as belonging to persons too self-absorbed, being the very definition of "first-world problems" for the Monk types among us.