Why do you think the boring company plan is so much more viable than improving public transit? Note that I am not using your strawman here (subways everywhere)

Why do you think the boring company plan is so much more viable than improving public transit? Note that I am not using your strawman here (subways everywhere) as that's not the point--the point is better public transit, which includes subways, busses, etc. That seems like a much richer target than building an entirely unproven tech.