there are frequent claims by semi-crackpots that the hedonic adjustment of inflation calculation is hiding a lot of inflation.
there was the famous shadowstats site, but it seems it shut down, or at least stopped publishing new stuff in 2023 publicly. (probably reverting to a good old affinity scam [5])
(fun trivia, noticed by a reddit user 11 years ago, that even though the guy claimed high inflation but the subscription fee remained the same over 10 years, and in the last post it was also "six months at $89.00".) and there are many posts [3][4] explaining why these alternate measures are very unlikely to be more correct than either the BLS' CPI or the BEA's PCE.
...
the BLS does a lot of work to have useful numbers for a lot of goods and services [0], down to computer parts [1]
and there are a lot of things that usually are now more fancy (and more expensive, of course), but don't have value adjustment in the list. (Matt Yglesias writes about the spa-ification of services, everything is nicer, fancier, from movie theater seats to barber shops, yet there's no adjustment for "haircuts and other personal care services"[2])
[0] https://www.bls.gov/cpi/quality-adjustment/home.htm
[1] https://www.bls.gov/mxp/publications/additional-publications...
[2] sorry, behind a paywall https://www.slowboring.com/p/the-spa-fication-of-everything
[3] https://www.economonitor.com/dolanecon/2015/03/31/deconstruc...
[4] https://www.noahpinion.blog/p/inflation-is-up-but-the-inflat...
[5] https://thebaffler.com/salvos/the-long-con