Volatility is not the only risk
A global equity fund can fall 20% or more in a bad year and still be a reasonable long-term holding. The danger is selling it there. Sequence risk — a crash just as you start withdrawing — is why money needed in the next few years should not be in shares.
Inflation is quieter and more reliable. Cash that cannot fall still falls in what it will buy. A decade of 3% inflation removes about a quarter of the real value, before tax.