I've seen this pattern in academic settings myself.

There's simply a lot of tunnel vision. Although, as a parent comment pointed out (a bit rudely) there's acknowledgement of various shortcomings of measures such as CPI, there's also a tendency to assume these models are accurate in policy-setting institutions.

I'd say they're maybe as accurate as predicting weather in the Great Lakes Region.

Also: r/economics should not be representative of economists, as a group. (Although they do parrot a lot of bank and government economist views.) Most posters there strike me as undergrads, who are mostly clueless to the fuzzy subtleties of the study (and life in general.)