Well, I've looked at the LoRa website and can't see anywhere that you can push broadcast messages to the IoT devices from the back end servers.
For example, if there's been a major accident with road closures etc., wouldn't it be better to broadcast a road closed to all applicable IoT devices (bikes, pedestrians etc) so they know not to go that route or even that area to avoid conjestions.
From what I'm reading, it requires each IoT to individually make a connection and ask for info which is a waste of bandwidth (considering they are limited to available bandwidth rates).
And as a star of stars network configuration, man-in-the-middle attacks will be rife.