If we assume that most users do not know what a URL is then why can we assume that the information handed to them by an origin chip is any more useful to them?
Same reason as some browsers started to grey out parts of the hostname - if the only thing a user sees is "bankofamreica.com" or "bankofamerica.com.foroigs.io" they have a better chance of catching the thing that's wrong. Noise/information ratio etc..