I think everyone should monitor their expenses for a time and try calculating their own CPI. It's a pretty fraught measurement even for the well intentioned, but ultimately it matters most how your own spending is affected. I first calculated my family's CPI in early 2020 and came up with ~7% while the official number was an insanely low 2% I believe. I think the 7% figure was still roughly accurate the last time I tried this, though I'm sure it would have been higher in the '21 - '22 period. Regardless, it's an easy statistic to figure for yourself if you take your biggest monthly expenses and compare them to a period a year ago (assuming you have some financial records.)

I use this when evaluating major investment decisions, before assuming any new debt or making major purchases, etc.. Leaving that calculation to a bureaucratic agency which could care less about your well being just feels a bit irresponsible. Also, everyone's personal circumstance is so different that one generic index falls short of being very useful.