Have you actually looked what some of their extensions look like?
Please go look at Encore station on Vegas Loop. And come back telling me it is below ground... And that is not only place. Overall it looks like right mess. Including very scalable solutions like single tunnels to some stations...
Please go look at Encore station on Vegas Loop. And come back telling me it is below ground... And that is not only place. Overall it looks like right mess. Including very scalable solutions like single tunnels to some stations...