What is the one thing provided by the MFT and not the FAT that makes it difficult to find small files?

In NTFS, file metadata is stored in the Master File Table (MFT) as opposed to the File Allocation Table in FAT systems.

There is much more rich data available in the MFT, but what is the one thing provided by the MFT and not the FAT that makes it difficult to find small files?

Are there other noteworthy challenges?

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600 words or more..??