The CPI Problem
Official CPI measures a basket of goods that is regularly reweighted and subject to hedonic adjustments. This can systematically understate the inflation experienced by ordinary households.
Housing in CPI
Owner-occupied housing is poorly captured in most CPI measures. In Ireland, the CPI uses 'mortgage interest' rather than actual house prices, missing the massive property inflation experienced by buyers.
The Bitcoin Answer
Bitcoin's fixed supply of 21 million provides a measuring stick that can't be manipulated. When priced in BTC, the true rate of fiat debasement becomes visible.