Notice that I didn't say anything about that being impossible. I just said it's harder to meet most of these requirements with a web app, because you have to solve problems that you simply wouldn't have otherwise while gaining practically no advantage whatsoever, which is why most people decide to keep building native applications. Some people happily shooting themselves into the foot does not invalidate this assertion.

Also especially ATMs are notorious for hanging inexplicably for seconds, not reacting swiftly to user input, and generally providing a rather poor UI experience. The performance and quality standards for POS systems, at least our standards, are quite a bit higher.