Those exist, however they handle rush hour rather poorly. Also, when the system malfunctions, vehicles are not retrievable. Human-operated valet service is a very inexpensive, very reasonable alternative.
There's still the matter of all the owner's crap in the car, and current EVs would need nearly as much engineering as ICE vehicles to sit vertically anyway.
For example, the Model S still has brake fluid, washer fluid, coolant, and transmission oil, all which are stored in conventional automotive containers and which would absolutely perform abnormally if the car were raised to vertical.
I also suspect the transaxle has open breathers which would drain oil in the vertical position.
EVs do contain far fewer moving parts and reduce drivetrain complexity over ICE cars, but in every production EV design I've seen you only save one fluid (engine oil). Tesla just hide the car's fluids from their owners by putting plastic covers over everything but the washer fluid and then demanding you take the car to an "annual service."
Interestingly enough: there's countermeasures you can take to prevent oil migration! GM actually had some rather interesting experiments in this area. They tried storing cars vertically for transportation[1] in the late 60s and early 70s.
> ... Chevrolet's goal was to deliver Vegas topped with fluids and ready to drive to the dealership.
> To do this Vega engineers had to design a special engine oil baffle to prevent oil from entering the No. 1 cylinder, ...
There are also non-technology reasons you can't store cars tilted 90 degrees. People leave small items, half-finished sodas, etc. in their car and wouldn't want them all on the back windshield when they get back. Not to mention, in a high-density packing, you don't save any space by tilting the car 90 degrees.
