That tax part is nothing compare to having a full or near full FRS sitting in my CPF.
A nominee can enjoy both, free: just take the cash distribution and pump it all (or as much as allowed) into CPF.
For example, if your nominee's Special Account is at $100,000, and if you have $100,000 of residual CPF funds that would go into your nominee's SA via the Enhanced Nomination Scheme (ENS), then there are two choices. You
could use the ENS, in which case the nominee receives $81,000 into her SA (the 2020 Full Retirement Sum is $181,000, so that's the current limit) and the rest ($19,000) in cash. There is no tax relief this way. Or you could use a traditional nomination (all cash), in which case the nominee receives $100,000. Then the nominee can turn around and top up her SA by $81,000 (the same amount)
and qualify for $7,000 of tax relief. Which is better? The latter, of course! It's the same total amount, same CPF interest, but with $7,000 more tax relief. This is free money left on the table with the ENS, a pure loss (except to the government).
If you think your nominee isn't smart enough to figure this out, then you can leave separate instructions. ("It's my wish that you do the following....")
That's why I suggest that the ENS is really mostly when you think your nominee is going to be irresponsible or at least not yet responsible enough. So you use the ENS to try to protect the nominee and his/her interests, even from him/herself. One clear example is when your nominee is a compulsive gambler, and so you highly value funding your nominee's CPF LIFE and MediSave resources. If your nominee is at least a reasonably responsible adult, then I wouldn't use the ENS.