The link to Downtown is another billion or more dollars with very little benefit. There's also no real route to go to Downtown without having to impact a neighborhood. There oculd be a connector running down I-10, but it wouldn't be suitable for HSR given the number of turns required.
There's not enough room on 18th for rail, especially from TC Jester East to the Heights. I don't think you could reasonably get a single line on it, and it would be a hazard for neighborhood children.
Did they say how exactly they’re connecting this to Downtown? A 90 minute ride turns into a 120 minute ride if you have to hope on a bus or Uber to DT. I’m just really bitter this doesn’t go directly DT.