[Yaggo]

I mean that the traditional cars have either an automatic transmission with locking mechanism, or manual transmission which has significant resistance when coupled with the engine with a small gear. The traditional car is truly freely rolling only in specific configuration (neutral engaged).

Electric cars have none of that. The wheels are connected to the motor with a fixed gear, and the electric motor without power can't prevent the car from rolling. Thus you can say the system is "free rolling" by default. There are no mechanical configurations, just a fixed single one.

[pengaru]

An automatic transmission is effectively decoupled when the engine is off despite being left in drive. Without the engine spinning, there's no functioning torque converter. So the most ubiquitous ICE configuration, the auto with a torque converter, defaults to a neutral equivalent when the engine is off and the operator doesn't explicitly put the trans in park.

[Yaggo]

Yeah, we can argue about the semantics of "by default", but the point is that the traditional drivetrain has more backup options than electric car, which must solely rely on (parking) brakes.