Why is the BLS changing the CPI methodology?

On the BLS website: 


"

January 2022 CPI weight update

Starting in January 2022, weights for the Consumer Price Index will be calculated based on consumer expenditure data from 2019-2020. The BLS considered interventions, but decided to maintain normal procedures."


I don't want to put on the tin foil hat just yet. Why is this being done? Wouldn't a change in weight decrease CPI data? 

 

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