A token is a magical contract between design and engineering; if we agree to use the same name to abstractly refer to the same value, it will produce a desired outcome.
If the blue a different team chose is not blue enough for you, you can make your own blue and apply it at the global scope or the individual element scope.
Like features, too many tokens can bloat your system and there's a not-so-theoretical limit where the browser starts taking a performance hit based purely on the number of CSS variables.
It's possible to generate enough tokens that they become their own hyperobject, impossible to comprehend from the outside, so well-meaning people eject from the system.
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