For me, i break down my net worth into 3 buckets.
1. CASH, CASH investments and SRS investments
2. Insurance policies
3. CPF OA, SA, MA
In this way, no need to bother liquid or non-liquid. For each bucket, I know what they are meant for and keep track of them separately. Bucket 2 and 3, i usually just update once in a while, but bucket 1 has my full attention.
But on the whole, all 3 bucket are my net worth. They must be viewed and planned in a holistic manner, all the way to retirement.
If you dont include your cpf, you are blinded on this 1 aspect. CPF can be like a long term bond. Ultimately you will get it when you reach a certain age. You can also buy house, invest as well using it. So why not keep track of it as well for your retirement planning.