Earlier quoted context omitted.
For critical data like that, it would make more sense to just have a modem on board. 5G should make this more possible with increased device limits.
5G is notoriously known for smaller coverage area than LTE, it made IOT impossible instead of possible.
4G might have a larger coverage per cell, but if it isn't able to handle all the devices trying to connect then that means nothing at all.
5G can have comparable coverage, by the way.