The canonical American setup of a house with a garage where you can charge your car is exceedingly rare in Tokyo. Most people live in apartments and don't have cars, and even suburbam houses rarely have garages. If they have cars, they're parked in the apartment garage or a monthly contract parking lot, neither of which has charging.
It's a solvable chicken and egg problem, and China cracked it, but for time being Japan is way behind the curve in EV adoption.
Robotic parking but not charging as part of it seems odd.
The trays that hold cars are either passed between different rails or rotated around like a paternoster lift(the Prague city hall weird elevator thing). It's just incompatible with the concept of a cable, and a third rail or giant bus bar docking plug upgrades for those systems would be too costly and risky.
Maybe that might have happened already if Japan was as insane as it was in 1995, but it just costs too much right now.