Yes, that's retirement, agreed. Either that or raise general taxation to provide every Singaporean a guaranteed, inflation-indexed, basic income in retirement. But the Singapore government prefers the "individual responsibility" approach, so there you go.
So why forced savings for housing? That's the lion's share of CPF, and you cannot explain CPF without explaining that.
In LKY's book, I remember reading that he wanted everyone to have a stake in the country, perhaps that is why. But it is scary thinking if our home values drop for whatever reason, much of our wealth would be erased.

