I think the skepticism comes from other companies and countries taking about using autonomous battery-powered sleds when the power of trains comes from the red

I think the skepticism comes from other companies and countries taking about using autonomous battery-powered sleds when the power of trains comes from the reduction to one or more traction units, which is far less complex. If they have dedicated conveyor tracks* above grade the system makes sense, but this is expensive due to the costs of grade separation. It's possible but probably the most expensive route. * The tracks should probably be catenary or third rail, not battery.