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You are completely wrong about this. The cashier UI is less friendly and has lots of functions. Many are designed to be used with a keyboard or with small touch targets.
The user UI can basically do nothing but add items and pay. It is drastically simplified with few larger buttons and a greater degree of thought put into UI as you don’t get to train every user to use your UI.
and the self checkout ui is worse because of the lack of keyboard
Yes because people who are using your system with the entirely wrong height to type anything absolutely need to be able to hit F3 instead of clicking pay. The whole shtick is having almost no functions. Add item, lookup items, pay