What kind of technology is going to keep a battery magically charged if left alone? Self-discharge is a built-in phenomenon of these batteries. The fix they have is that the car can "phone home", and that's what Tesla and other car manufacturers are doing.

I know two people who have bricked their gas-powered cars by going too long between oil changes. This isn't a novel problem for complex machines. You need to maintain them if you'd like to continue using them.

No, but if it runs out of oil, and especially if you let it sit for a while, your engine can make a very good mimicry of a steel brick, and that's one of the more expensive pieces of your car to replace. Probably more than 4/10ths of the cost of the car, in many situations.

We haven't fixed this. Have we the technology?