Pretty sure emergency mobile broadcasts are included (at least by gov agencies) but you know what happens with these things that are only used for emergencies:
"It's annoying can't I turn it off?"
That's why I still think the more methods the better. It's probably one of the few reasons I'm okay with being bombarded with messages (not in jp, but literally got 2 earthquake warnings yesterday).
It was always there, but we've long ignored the warnings. It invented the Internet, which we took for granted. It wasn't until Gore seeped through a series of tubes that we realized, but by then it was too late.
It had already taken over the windmills.