Not going to replace checkouts because this is neither convenient or low-effort. Also, there will be random checks where you're 'randomly' (AI surveillance based on risk classifications and 'suspicious behaviors' e.g. taking your smartphone out of your pocket can be construed as theft) picked out of a line and all your 'scanned goods' are verified.

If the customer is asked to do the work on behalf of cashiers, then the concept is doomed to fail.