It's very logical. The system is designed so that if the available power is in use, those people keep getting power and other people can't get power, rather than tripping a breaker that cuts off power to everyone. That's both better for the people currently using the system and it also means that when the load is reduced other people can start using the system. And all without having to reset any breakers.

Such a system would be too complex and expensive in a home, where you can just go down to the basement and reset a breaker if it trips. Also, the source of the limitation in the home is different: it's the risk of fire from drawing too much power through the wires, rather than the limit of the amount of AC power that the available inverters can supply. If the in-seat power system were overloaded, it wouldn't cause a fire, it would just mean that people would get insufficient voltage.

That said, I don't think most accounts of people not getting power have anything to do with overload situations.