My Tesla has maintenance done every year or 12.5K miles, and that isn't required to maintain the warranty. The big services happen every four years (50K miles) where they replace the brake fluid and coolant. The motor is lubricated for 12 years. The yearly maintenance includes replacing the cabin air filter, wiper blades, rotating the tires (which should be done more often), a wheel alignment as well as cleaning the car inside and out. They also check the brakes and other things and apply any fixes that are needed.
I don't have to get my oil changed, belts adjusted, spark plugs changed, air filter changed or get emission checks. There's no ignition system or fuel pump to fail, no belts or belt-driven accessories to fail (like AC compressor, power steering pump, alternator and water pump). The water pump is electric and a sealed unit as is the AC compressor. Sealed units tend to be more reliable since it's much less likely they'll develop a leak where the shaft pokes through.
The only major issue I've had with my car is in the last year I've had three rims destroyed due to our roads going to hell. I've since gotten higher profile wheels so hopefully this will no longer be a problem. My car is an early one too. The newer cars are much more reliable and better since they have learned a lot in the last 5 years. The things that caused me issues have been redesigned (i.e. the door handles).
Also if things do fail they're much easier to access since there isn't a big engine in the way. If they do need to access the drive train on my car it's *much* easier than an ICE vehicle. Similarly, the battery can be swapped very quickly.