[WorldMaker]

This is going to sound flippant, but I mean it seriously: The advantage to fungible electricity seems to me that we've already solved the hard parts of charging infrastructure. We have electric grids that reach just about every building, and with modern lighting standards most parking lots and parking facilities too.

Certainly there are "last mile questions" like number of charging devices and type of charging plug(s) and adding plugs to circuits/stringing new circuits near building exteriors and in parking lots and figuring out who to charge for that, but none of them have particularly "hard" problems left to solve at this point.