Self-checkout seems better to me, because it decreases monotonous and forced public interaction (thus somewhat automated anyway): Beep. Beep. Beep. Do you want loyalty points? That's 21.46€. Do you want the receipt? Goodbye! Beep. Beep. Beep...
It uses less space.
It is parallel instead of serial.
The work is not much more than putting groceries on a checkout lane anyway, except for unlabelled fruits and vegetables.
Self-checkout allows for smaller stores and coops, for example in villages or as kiosk.
There are FOSS games with a single branch for development, which doesn't scale well for stability, but works fine with slow development.
Others, have stable and experimental branches with backporting and so on. Probably works better, but too much delay between stable and experimental makes people play on experimental. Stable releases are expensive (redundant bugfixing, backporting, feature freezing/completing etc.), so not every projects has or wants them. Fast development might enable modding to turn into internal (optional) features though.
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