While the battery is bespoke and sold as part of the EV, standardized swappable batteries will not make any sort of business sense with each EV having its own custom battery model. Once diminishing returns sets in for the car manufacturers with new battery tech slowing, they will jump all over...
Pretty good summary, not moved on much since it was written:
https://www.caranddriver.com/news/a22573389/batteries-not-included-is-pack-swapping-the-reboot-that-affordable-electric-vehicles-need/