Cherry picking an article seems to suggest the US has similar problems www.investmentzen.com/blog/average-401k-return

Australia’s superannuation has improved over time. For example, the MySuper reforns led to consolidation and an exodus of underperforming funds.

A quick search on some of the biggest super funds in Aus shows returns of > 9% in a more equivalent, potentially volatile “high growth” fund.

There are funds that offer lower cost index-tracking products if that’s your thing.

The biggest problem, IMO, is financial literacy which needs to play a bigger role in education.