Concentration creates wealth and diversification preserves it.

It is generally accepted that this saying is true. If you make say 50-100k making an average income and have average savings what’s the point of this sub always recommending voo,spy. I’m not saying to be full wallstreetbets but like, what’s the point of aspiring to put 90% of your income into an etf, 5-10% on single stocks or riskier pIays the goal just to be average and retire in your 60s? Just curious on the mindset. Thanks.