An accelerating and historically high broad societal effect is naturally a product of broad and unique properties of the current regime, rather than fundamentally consistent properties, which would naturally be seen across all time.
What is more broad and far-reaching than manipulation of the money supply itself? “We have found that inflation (1) worsens income distribution; (2) increases the income share of the rich; (3) has a negative but insignificant effect on the income shares of the poor and the middle class; and (4) reduces the rate of economic growth” http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.295...
It’s not difficult to see why - under an inflationary regime, those holding currency lose out relative to those holding assets, because the former’s wealth is not preserved; and low income wages are facing a constant headwind that their earners are less equipped to navigate.
We in the US have been engaging in an experiment since 1971, which has resulted in a marked discontinuity and a shift in to whom productivity growth accrued: https://wtfhappenedin1971.com/
This is not necessarily the true or only explanation of our accelerating and historically high inequality, but it has the properties of a realistic explanation, in that it identifies a broad, historically distinct cause.