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True, but...
  1. meshtastic devices ara cheap,
  2. bluetooth chips on phones are not equal, so diminished reliability,
  3. bluetooth signal is easily jammable,
  4. there's a tendency to "steal" our privacy on phones by manufacturers and govts, so this also limits possible usage.
I might have jumped the gun with my comment, but in all seriousness I can't see it as more than a toy for peace times. For serious usage it's not enough.