I think times change though. Government bonds that are supposedly "safe" right now seem more like a guaranteed way to lose money.
Honestly, I know the theory, but nothing beats the massive gains ... even if you lose some when the market falls, you were much further ahead in the first place so still come out ahead.
I think the 60/40 stock/bond split all all the variations (100 - your age in bonds) are all part of the system that the financial industry uses to make money.