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As prevalent as disks once were, they are now a dying breed. Soon they will have gone the way of tape drives, floppy drives, and CDs. They are being replaced by RAM.
Ask yourself this question: When all the disks are gone, and all your data is stored in RAM, how will you organize that data? Will you organize it into tables and access it with SQL? Will you organize it into files and access it through a directory?
Of course not. You’ll organize it into linked lists, trees, hash tables, stacks, queues, or any of the other myriad data structures, and you’ll access it using pointers or references—because that’s what programmers do.
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Robert C. Martin (Clean Architecture)