What usually happens nowadays, is that technology greatly increases the amount of force which can be cashed out for. The start of the Nuclear age was literally applying a "new" (heretofore not yet applied to war) physics.

Applying space forces actively to war could well be applying a new part of the universe to war. (Airplanes and submarines were also this.)

Ok. How does that change the paradigm? It’s still a use of force ...

In potentially the same way that nuclear weapons did. No one can "win" a nuclear exchange, unlike those who thought many of the previous non-nuclear large conflicts would be over quickly (both World Wars and the US Civil War come to mind). Nuclear weapons are still use of force, but provide deterrence in a way conventional forces can not.

But not _everything_. Is your city going to invade a neighboring city if it decides it wants a better property tax base?