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Metadata needs to be understandable for your authors to apply to the attributes. If you propose using misleading metadata names, abbreviations, or other metadata names that your information developers don't understand, your possibilities for incorrect metadata values increase.
Also, if you do not provide standard metadata values for your information developers to use when assigning metadata, it is possible that they may add incorrect values that make the styling, production, search, retrieval, and other maintenance of your content frustrating. You also face the possibility of losing content in your filesystem or repository—because you can't find it again based on the metadata your information developers apply to the content.