No it’s the fact that when these things catch fire you can’t put them out. Even when you do put them out they reignite themselves an hour or so later. If one of those cars caught on fire in a below building garage it would likely burn the whole building down And set ablaze every car in the garage due to a chain reaction Not to mention you can’t get a fire truck down there
You do raise a good point. It seems likely that below ground parking operators will need to adjust fire suppression measures