There are certain amount of truth on long term pick of S&P500 ETF could allow layman investors to ride far with strong return. Will this implied for the next decade or two ? Is all probability and this solely rest on Fate of America and Currency. At this moment in time, that Index is elevated. Will it go higher ? That's hard to determine.
Is also true as well that when there is broad market draw down, chances are both Index and Individual stock pickers may suffer as well. One way to counter such situation in total return perspective is have bonds. Treasury specifically if one want to eliminate company risks. And for US, forex risk. In bad time there is chance the currency will strengthen with high yield and in good time vice verse. All this is probability imo.
In local context, T-Bills and SSB are good enough instrument to negate forex risk and capital loss. However, there...