Correct. They simply caught fire, and there were two potential design flaws in the system. The first was no fire suppression in the compartment with the batteries, only smoke detectors. The second was fire containment, concerns that it would be insufficient (especially paired with the lack of fire suppression systems) to contain a fire.
Compare to the Tesla fires: still no fire suppression baked in; deliberate effort in containing and directing the fire away from passengers; ample notice (so far) to drivers that something is wrong! and that they should pull over.
Also, I'd take a fire in a car over a fire on a plane any day. The car is: cheaper to repair/replace; already on the ground. If a plane has a fire, sure it'll end up on the ground, but depending on where on the aircraft and the effectiveness of detection and suppression systems it may not be a state where people can simply walk away from it.
