It would, but the web is a mass-market project - while it would be nice if everyone understood how to read a URL, we should cater to the lowest (within reason) common denominator - especially when it comes to security.
The threat model for phone numbers is considerably different, not least due to the link-based nature of the web and email. The URL takes on the role of both the number and the caller ID (if caller ID didn't suck) - you should be able to be confident that you're talking to who you think you're talking to.
The threat model for phone numbers is considerably different, not least due to the link-based nature of the web and email. The URL takes on the role of both the number and the caller ID (if caller ID didn't suck) - you should be able to be confident that you're talking to who you think you're talking to.