The CPP delay / early calculations are designed so that the average person, with the statistical average length of life would receive identical amounts regardless of the choice.
The government can rely on averages / stats because of the millions of people involved, the stats will generally be correct.
You or I have other considerations -- like the ability to draw down the RRSP early, over many years of early retirement (or until age 72) to reduce future taxes, and then take the increased CPP / OAS after that. Maybe we can even tell that we are in excellent health at age 65.
Of course, there are a lot of arguments about leaving your RRSP in tax free growth mode while you have 20+ years left before you take out most of it.... however less than 20 years and the tax free benefit starts to decline, and the tax impacts that you pay over your remaining life increases.
The biggest risk (if you intend to leave money/estate behind) is having a large amount in your RRSP/RRIF and no spouse when you die. It will be taxed up to 54%. Yikes. A hidden estate tax. Compare that to draining it over a 10 year period when you are not pulling CPP/ OAS and have low income otherwise.