choosing to build an application on top of bluetooth is like saying, "we've constructed a highway over the most stable terrain known to man: volcanic marshes prone to seasonal flooding."

how do you know when the messaging app is broken, and how do you know when bluetooth is just exercising its ability to hate mankind?

What else would they use? This is for when your government has turned off all sensible networks.

Funny, but I think you're missing the point here.

This is not meant to be an efficient, every day messaging platform.

It's for people who are afraid of the government turning off the internet/cell network (kinda justified if you live in Iran or Uganda), or those networks going offline due to natural disasters (see Jamaica)