Travel
Craft exploit solar/planetary magnetic structures, including Parker-spiral concepts, manipulate magnetic loops and use field effects for travel and concealment.
Moral/scientific resonance
The technology embodies flow rather than fight: working with existing forces rather than simply overpowering them.
Limits
The science should feel costly and engineered. A lunar staging/quarantine area is important, and conventional protection such as a NASA suit may still be necessary in environments Fin's field envelope cannot handle.