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Why does stromatolite biostratigraphy have limited use for correlating Precambrian rocks?

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A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Precambrian The stratigraphic chart of geologic time.

Stromatolite biostratigraphy has limited use for correlating Precambrian rocks because its application remains relatively restricted compared to the fossil-based methods used in younger geologic periods. While stromatolites underwent evolutionary changes that allowed for the subdivision of certain sequences—such as the Riphean in parts of the former Soviet Union, China, Australia, and Spitsbergen—they do not provide the same level of widespread, reliable correlation as the abundant, rapidly evolving fossils found in Phanerozoic sediments.1

Because Precambrian sediments generally lack the diverse and rapidly evolving fossil remains necessary for precise biostratigraphic correlation, geologists primarily rely on the chronometric time scale and geochronology techniques, such as zircon dating, to correlate rocks across regions and continents.21