One thing that is consistent across all markets is that eventually the car will require replacement parts. What is not clear is if the EV car will be able to be repaired cost effectively.
But bear in mind that Evs have a lot fewer things to go wrong
What happens when an owner of an EV receives a ridiculous quote from a dealer to replace the battery?
Same as an ICE that needs work in excess of its value - break for spares.
As regards batteries that are too degraded for use in the car, they will often still have significant for home storage.
My problem is the not so free-flow of specifications on electronic parts. How many of these parts are proprietary little black boxes? Once the original parts dry up, we turn to non-genuine parts, which are almost always built from scratch. Physical parts like panels or hoses are easy.
How does one reconstruct, say, a fried charge controller if the technical information is not forthcoming or no longer available? I just wonder the ramifications when cheap, exotic replacement parts find their way in to these things.
Usually the electronics are built to last a very long time so I wouldn't worry about that too much. But you'd have to investigate how a particular car model does where it comes to common failures and the cost to fix them. There are companies who specialise in fixing car electronics for a reasonable price so it is not like you are completely dependant on the manufacturer for a replacement in case you have a defective electronic module.
In general costs of a car depend on whether you buy new or second hand. If you buy a new car, drive it for up to 5 years (or to about 100k km) and then buy a new, one then the costs per km will be dominated by depreciation and maintenance costs will be very small.
OTOH if you buy a used car which is about 5 years old and drive it into the ground then the costs will be dominated by maintenance. From my own cars (extremely common models so parts are cheap) I see that the cost for maintaining suspension and tyres is the largest part. The older a car gets the cheaper the parts become.
At this point in the life cycle of EVs, it seems to me to make most sense to buy them new, covered by a long warranty. Maybe even leasing makes sense, especially if there is a risk of depreciation. Your annual mileage needs to be high enough for the fuel savings to materialise for you.
Owning a used car economically depends on (1) stuff not breaking so often, and (2) when something does break, cheap spares have to be available (preferably OEM spares... dealing with quality and fit issues with Brand-X replacement parts gets old real quick.) EVs just haven't been around long enough, in sufficient numbers, for the spares market (including recycled parts) to have become widely developed for them yet.