The reason criticism is warranted is because unfeasible, far out ideas like Musk's distract the conversation from proven and viable solutions and undermine their implementation.
Musk is providing ammo for persons that oppose public transit spending for political and idiological reasons that can be used in the political arena to argue to decrease public transit spending and slow down or stop implementation of public transit expansion.
Musk is providing ammo for persons that oppose public transit spending for political and idiological reasons that can be used in the political arena to argue to decrease public transit spending and slow down or stop implementation of public transit expansion.