Well, you're kind of ignoring the main point of my argument: current ICEs are sufficiently reliable that when something breaks on a modern ICE car, 95% of the time that component is completely unrelated to the engine. So even though electric motors are even more reliable (I agree, they are), this only gives you a reliability increase of 5%.

This is basically Amdahls law. Improving the part that causes 5% of the problems will at most solve 5% of your problems.

Edit: and you're wrong about the brake lines. Those need servicing because of surface rust, which happens regardless of how often you use them.

And funnily enough, brake discs can have shorter maintenance intervals the less you use them: again, surface rust. If you're driving in wet weather in a normal car, heat from braking dries your discs up. That doesn't if they're not used that much.