If you're talking about a gas engine, you're missing the complexities because they've been with us for a century.
If you don't change the oil regularly, the car breaks down. If you leave old gas in the tank for a year, the car won't start. If you don't change the filters, the car eventually breaks down. If you don't change the belt after its admittedly long life, the car breaks down.
You swap all that for the need to keep the car's battery somewhat full to maintain a constant temperature in the battery bay. You don't do that, the car does it on its own. Just plug the car to recharge the battery somewhat frequently, dependent on your weather.
If you don't change the oil regularly, the car breaks down. If you leave old gas in the tank for a year, the car won't start. If you don't change the filters, the car eventually breaks down. If you don't change the belt after its admittedly long life, the car breaks down.
You swap all that for the need to keep the car's battery somewhat full to maintain a constant temperature in the battery bay. You don't do that, the car does it on its own. Just plug the car to recharge the battery somewhat frequently, dependent on your weather.