One of the most important aspects of bitcoin is it’s censorship resistance. You might say the whole thing is built around that prime directive.
We talk about bitcoin “broadcasts”, but if they are relayed over a wired internet connection or centralized mobile network, nodes can easily be blocked or monitored - which can amount to the same thing.
Usually people point to TOR or IPFS as a way to avoid monitors or blocking, but those are complicated solutions and run their own risk of being blocked and monitored.
A true physical broadcast system offers a whole different level of privacy and censorship resistance. Especially a system that uses intermittent low power mobile broadcasts…