Short-cuts have their place. If you can avoid complexity and effort, it makes absolute sense to do so. It gives you time to work on other projects, or in my case re-watch The Treble (1999), reliving the good ol’ days. However, when it comes to retirement income, short cuts may be counter-productive and nowhere is this more apparent than with the 4% rule.
Evolutionary psychology highlights a Stone Age mentality hardwired into our brains and reflected in our behaviour and habits. For example, we tend to organise ourselves into groups in order to adapt more easily to different environments: behaviourally it is far less dangerous to be wrong in a group than to be right on our own. This explains the desire and impulse of an individual investor to follow the crowd.