To be fair, there's a massive difference between the machines I've seen at least in Switzerland and the ones in the UK/US. In the latter, they seem far more anti-shoplifting focused, forcing you to place each item and wait for some delay before you can scan the next item, loudly announcing every step of the process, etc.

There's still some variance in the latter countries between supermarket chains as some are noticeably faster or require fewer taps than others, but the general experience in most every chain is far less pleasant than in every major supermarket brand in Switzerland.