By William P Bengen.
Bengen originated the 4% rule for retirement portfolio draw-down. He revisits this strategy in this book. With the right portfolio he says the safe withdrawal rate not starts at 4.7%.
I see the concerns people can have with the 4% rule. It's not a stretch to call the math behind it curve fitting. Honestly, that's probably as true of monte-carol simulations. Of course you can't really predict the future. You can only make sure that your facts and theories are aligned, and prepare for the day when that is not enough.
Retiring now is... interesting? Inflation is high. The Shiller PE ratio is near an all time high. As I retire, we are starting off at a 3.5% drawdown rate. If things go wrong then we have buffer. If they don't then we can give ourselves a raise.