Isn't it such that if one has > FRS in RA, one can pledge/charge ppty and thereafter withdraw 1 * BRS?
You still can. Those lump sum withdrawal options don't change. What changes is that you'll still end up with a >FRS level CPF LIFE retirement income stream even if you max out your lump sum RA withdrawal options. That makes exercising those lump sum RA withdrawal options (in a dire emergency, presumably) more palatable and survivable. (BRS level CPF LIFE is really not fun.)
Sure, OK, evaluate your liquidity position and make sure you maintain adequate liquidity. But a S$99,400 RA top up (2023's figure to raise a RA from the FRS to the ERS) just ain't that big a deal for many people. For perspective that's much less than any new car (something that's nominally but not terrifically liquid), and you don't have to pay for fuel, insurance, parking, or maintenance. Plenty of people seem to buy cars that cost twice that just to buy, and they don't seem to agonize over liquidity when they do it.
"Don't be silly," basically. If you've got enough liquidity to buy 3 yachts then it's OK to drop your liquidity down to 2.99 yachts. Metaphorically or actually.