Sure, truth is subjective. We, humans, when we go out of our heads and into the world, we must share a common truth — the same things that we believe to be true — that will hold its ground for an indefinite time.
In user interface design, there’s this thing that we call “single source of truth”. It is a design artifact that everyone refers to when needed. For example, what is the single source of truth for our brand color red?
Surely, if that red’s color value exists in one designer’s safekeeping, they might have missed (whether they missed the news entirely or missed updating their own instance) that the branding department have already updated the shade of the red which they also have in their safekeeping.
Then we can surmise that the benefit of having a single source of truth for the color red boils down to efficiency. Efficiency of maintaining only one instance (works well in the digital world) and efficiency of communications because everyone trusts that the instance is aligned with everyone.