This is a different situation than self-checkout at supermarkets. There yes you could argue a cashier who is experienced with scanning items all day and has access to a fully-featured POS can scan all your items faster and more efficiently than you could ever do on that locked-down self-checkout pos, and owners who take away cashiers are purely saving money at the expense of your time. But here you yourself have to communicate your order either way. I much prefer to browse at my leisure and tap at pictures rather than shouting my order 3 times while there is an impatient line behind me.