The fable of the ant and the grasshopper comes to mind.
The number one rule in investing is that more than asset class, diversification, tax loss harvestig, taxable v. non-taxalbe, savings rate is what matters most of all for income earners. If you don’t save, you won’t have a retirement savings.
In retirment, it will be spending rate that will matter most.
Those who don’t save deserve exactly what they have coming to them.