So what metrics do you use?
In my case... my own. Because in reality those are what matter to me and my family, my income, costs and overall budget.
How much has my income increased. Less than 3% per year the last couple years and expecting about the same for the next year. My wife's significantly less than that.
How much have my costs increased. Some things more than others, insurance, close to doubled, groceries double, taxes at least 50%, car loan rate several percent, which adds a lot per month, cost to eat out, about double, (fast food much more than sit down, in many cases) costs to travel hotels etc just guessing about 30-50% increase, costs for things like toiletries, car repairs, household items etc have all seen significant increases over the sub 3% per year rate of the CPI.
Sure my investments are up, but its not like I am pulling out those capitol gains, I am taking some dividends to cover some increases in costs currently though. And it is very dependant on the stock and sector, as some are not doing very well. But thanks to a few bangers my portfolio looks pretty good. And I believe I am probably in the minority with my investments and my house paid off.
That doesnt mean what I have budgeted for things like season tickets, donations and entertainment, etc has not been significantly decreased because of the current cost of living. What I have for those things is not infinite and when costs for necessary items goes up, it pulls directly from the unnecessary budget.
The CPI has a lot of flaws of which have been covered a lot by many financial sites etc like the one I posted above. It just doesnt do a good job of showing actual real cost of living increases and least not comprehensively, it has a lot of limits to what it actually shows. In reality you probably have to look at several indexes, to get an actual comprehensive look at the overall picture.
Ultimately while inflation has stabilized in the recent few months, most consumers are still trying to adjust to the inflation over the last few years. Its not like any of the products we regularly purchase will ever reduce their prices or increase their sizes to recover for shrinkflation.