The boundaries contain and define . Shapes, forms, organizations, relationships and so on. Without limits, we will get ill-shaped, obese and astray. Since, without limits we can not perceive, so should not lose our limits.
I calculate and find how much and that is a measure , a limit. We get paid and evaluated on limits. It is determined on logic and vision. Sky is the limit but then space became our new limit. Perhaps there is more than that, it expands but remains contained.
In friendship too, there are limits and boundaries for the real and virtual because that keeps us at good levels.