The UK has used self checkouts for 15 years or so now. They work fine, are quick and I’ve never seen an “obscure error message”. You need to wait for an attenda

The UK has used self checkouts for 15 years or so now. They work fine, are quick and I’ve never seen an “obscure error message”. You need to wait for an attendant if you’re buying alcohol, but otherwise it’s seamless. Sounds like crap software and a customer base not used to things the first world take for granted rather than an issue with the idea itself.