That doesn't get VC money and crazy people screaming about it. Boston/Cambridge is full of those and it's a pleasure to be on them but there's no crazy CEO trying to sell it so no one bothers to pay attention to them.
I'd recommend you take SEPTA in PHL or use the shitty stuff we have here in Miami and Orlando and you'll be praying to go back to riding the Red Line or even, god forbid, the green line.
Houston population is 2.2M in the city, 7.2M metro area (most of whom at least regularly spend time in or commute to Houston proper).