I must say, as we grow older, we become less risky when it comes to investment. Because you will need the money for other things in life/family.
indeed your risk appetite gets lower as u grow older. i'm not advocating all in equites especially if you're in your 50s.
but i consider CPF within the broader context of my overall financial health and portfolio. it's like playing soccer. CPF is your goal keeper. but u should also have other mix of defenders and strikers (HDB, REITs, ETFs, stock pick, etc).
IMO FRS is already able to fulfil the needs for basic living. it's like a bond portfolio; low risk, low returns. whatever happens, you will have a basic security.
beyond that, you should take some risk and ride the volatility. if there's a market downturn? then cut down on your wants, hunker down and wait it out.
something like this:
https://www.dbs.com.sg/personal/articles/nav/financial-planning/life-after-work
but if your portfolio is already so big that realistically you won't be able to spend finish in your lifetime, then maxing out the low risk low returns instruments is also nothing wrong. it's like you're leading the soccer match, then all your players become defender and park the bus until game ends lor.