Recent experience in regard to impact of increases in oil prices, and more recently elevated food prices shows that ignoring the structural or permanent elements of what is traditionally treated as shocks may slow down appropriate monetary policy response especially if the focus is on "core inflation". Accounting for house rents/prices in inflation measurement has also gained attention in some countries.
The central banks are often concerned with the stability/variability of inflation rather than the level of prices. Inflation processes have become highly unclear and central banks are faced with the need to recognise the importance of inflation perceptions and inflation expectations, as distinct from inflation indicators.