I thought the same at first. However I can see how it might work, in the corporate world.
We like many others are currently stuck with IE11 as a default browser (as well as Edge). The company does not allow Chrome or Firefox :(
I assume the new Edge will be wrapped up in Windows with 'easily' manageable tools so the company will have no reason/choice other than to allow it. So now (unlike with old Edge) you have a reasonable browser that people can use in work and at home.