Back post WW2, tax-deferred pension plans became fashionable as a way, IMHO, of intervening in the inter-generational transfer of assets and skills.
These pension plans were then managed by professional fund managers, and grew and grew and grew ... These funds are operated in a mostly speculative manner for the better interests of the fund management. And now the individual contributors (notice how they are not referred to as investors, the investor is the fund (managers)) want to retire and withdraw their money.
So, now who is going to purchase the stocks and bonds required to 'invest' in capital projects? So much for capitalism, first one would need a pool of capital.