One measure of self-awareness may be reacting to being observed. Self-awareness necessitates ability to differentiate from other, and that implies registering that other as separate. Interaction makes and re-makes the participating individual's identity, not only because of observation (from other), but also introspection (observation from self). Nothing needs to be revealed outwardly. If a person is honest and takes note, this exercise may refine into a degree of self-knowledge, indicating progress towards individuation.

Individuation weakens the authority of other on the self. It makes it so one can find peace in themselves, not fighting in constant defence of their boundaries like in wartime. Individuated person is no longer defined by their boundaries, but by what happens within those boundaries, ie. mission or values. This is how the EU eliminated its internal borders (just a metaphor).

A zero-trust behaviour implies a real or imaginary challenge to boundaries (real threat = Russia, imaginary threat = what led to Brexit). Only in some cases is the challenge real. In others, the observation from other is overstated to justify isolationist behaviour or comfortably undo integration or progress.

Privacy is not the end goal, individuation is. Privacy is only a means to that end.