I think it's also relevant that CPF is not only a pension schema but most importantly also a home ownership scheme via HDB OA https://www.cpf.gov.sg/member/home-ownership/using-your-cpf-...
In fact, this had become a hot button issue in the elections. All this while, and even today the government claims that the people are the owner considering they can sell the units and book profits. On the other hand, they justify the 99-year limit, as a step to being fair towards future generations in a land scarce country.
There have been many policy and public discussions around this topic. But, as of date, there is no firm or permanent solution to this conundrum.
My comment came from two observations: 1. The majority of Singapore citizens live in HDB. 2. The vast majority of non-landed residential properties (private condos and HDBs) are on 99-year leases.