In this context, I think security theater would be a website, for example, that forces your password to include uppers, lowers, numbers and symbols - making it impossible to memorize your password, so users are forced to write it on a scrap. Then - true story - one site I use regularly requires a password from 6-8 characters long. No more, no less.
How much does this do to reduce account security? Plenty. But it provides the feeling of security - thus, theater. Medical machines could do just the same thing; in fact, I think it’s likely to happen if this article gets traction.
