You do not always want to view the entire list of phones on your phone to find the one you need. On the one hand, the favorites do it well:
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But if the record is not in your favorites, you still have to look through all the records, including “Kohl Electric” and “Lena from the stream”, which you call once a year or simply do not want to delete it just in case. For this, it would be nice to mark the record as unimportant.
The analogy can be extended to other lists, for example, to the list of friends in a social network. I do not add many people as friends, but some are different :)