It might test well in metrics, but this is the kind of thing that points out why purely data based decision making can be dangerous. A-B testing assumes users will all behave the same in the future as in the past. But people's future behavior is dependent on their present behavior and experiences.
With repeated exposure to URLs more people will learn how URLs work. Hiding URLs means that people will never be able to learn.
I hate that copying the domain in a modern browser copies the protocol along with it. Highlight just "google.com", copy. Paste it and what is pasted? "http://google.com/". Makes dig/whois really annoying.
Related: Microsoft's decision to hide file extensions by default was arguably one of the worst UI mistakes of all time, leading to naive users launching coolpic.jpg.exe because all they saw was coolpic.jpg, among many other problems.
I think it's quite ironic that you just received four different suggestions of how to solve this problem. None of that would even be necessary if they didn't try to hide the information in the first place.
Apple never showed the path prominently in the first place. Since System 7 you can Cmd-Click the title bar to show a menu with the path, and you can use Cmd-I to show the path in the Info panel.
Not including a path bar by default doesn't mean they "try to hide the information", it's just a different UI design.
With repeated exposure to URLs more people will learn how URLs work. Hiding URLs means that people will never be able to learn.