No, it's not an oversight. It's actually quite logical.
Phone App - Press the name, it calls. Press the icon it shows you the information. Most of the time when the user is viewing their call history, they're interesting in calling them back. So making the primary action to call them makes sense. The more information is a secondary action.
Logically speaking, if you are in the phone app you are interested in calling someone or viewing missed calls. So they made the contact icon link to just a phone list instead of the people hub.
It sounds like you guys were actually using it as your link to the People Hub rather than having the tile on your home screen. While I can understand that use case, I don't think its that big a deal to actually have the People Hub on your start screen and go directly to it. Rather than adding additional steps by going through the Phone App.
If you want to add a phone number that was called, or manage that phone numbers contact card (add email, etc) then just click the more info icon in the call history.