A standardized unit of measure is almost definitionally a label of convenience, what? Why was there no concept of a meter until the 1790s? It was determined by a council of people, does that sound like a truth of the universe?
This is being intentionally obtuse and you know it.
A meter is the same anywhere in the universe. If it's not, it's not a meter.
The defintion of "fat" changes based on any 3 people in the room. A handful of people would struggle to form a consensus on if all people, dogs, mice, worms, and/or bacteria are conscious.
A label is distinct from a definition. Contrast that with "tall" or "short", which are entirely context dependent and used entirely for convenience.
Words like "just", "free", "fast", "fuzzy" fall into the second category. Perhaps "conscious" too.
The difference is the presence of a strict definition that depends upon a physical absolute. I can point to a metre. Suggesting that it's nothing more than a label is idiotic.