There's always added risk when using a third party client since you trust an additional party when using the app. We know their dev and I trust it personally. Molly is also reproducible (you can test their APK matches an APK you build with their source code yourself). None of this stuff really matt...

The questions here is if there will be FOSS military tech that can be produced and used by anyone. Robotics could be a huge enabler for a small team.

text -> sound speech in language u cannot speak say L2 u type L1 -> play in L2 s u wanna ask Q in another luguage when traveling download arm-aarch of llama.cpp + mode file in andriod shell turmux thats it

Meshtastic is more dynamic and self-organizing, so its stability heavily depends on node density. MeshCore is more dependent on planned, fixed repeaters and controlled networks, which makes it less flexible but generally more predictable and stable.

Lightning is pretty private if you run your own node, but spark is not as private. If you're concerned with privacy, there are other options.