In any case, I don't really understand what point you're trying to make. For the phone system we assume the phone company will route our call correctly. Sometimes they don't! Over the years I've seen a number of anecdotes where someone called a number and was connected to the completely wrong person, and when they tried a second time it worked. At least the DNS system allows critical sites like banks to use features like certificate pinning if they're afraid of hackers intercepting their domain and having a DV cert issued by a trusted root.