Signs give the information needed to let viewers navigate. ALL they need to do is present that information clearly and easily, they have no active involvement in navigation. A computer UI needs to present navigation information BUT it's also the navigation tool.
Those appear to me to be different requirements. It doesn't matter how space wasting, clumsy or whatever road signage is, it's a different system to navigation and once familiar with a route I don't use it. Once familiar with my UI I still need to use it constantly. I want signs optimised for legibility, my UI optimised for navigation.
Metro de-optimises my navigation to present information I won't need after the 1st few uses. Worse it doesn't even manage to show navigation information better, with hidden controls, acres of wasted space and the 1 size window fits all idiocy. The control elements in my UI are there FOR CONTROL not to show information. The navigation elements are there to let me NAVIGATE not tell me where I'm going.
This whole UI is backwards, designed by idiots so in love with an abstract idea they forgot what the fscking system is meant to do.