I think this kind of circular EV economy is the real big money logistics idea. There is, as you've astutely pointed out, no reason why this protocol shouldn't exist industry-wide.

But, how do you solve the materials problem that closes the loop: somehow recycling old EV raw materials into new EV materials? AFAIK there still aren't great SOTA solutions to this. At some point, it's hard to have a nice closed cycle of production and waste-recyling for ecological and cost optimization purposes.

Right now the market for recycling EV batteries is still pretty small because there just aren't that many old EVs around. I bet recycling will increase in a couple years.