Stabilizing a blank does not replace the wood! Nor does it turn wood to plastic. the wood is still wood. Have you ever done a money blank? It is 95% PR. Yet when turned, the shredded money makes dull spots where it comes to the edge of the turned blank. Unless one want the dull spots, it should be finished with a finish such as CA, lacquer, poly etc.
Listen to Mr. Cook. You don't have to do finish it with CA as that is your choice. It won't destroy or hurt the blank to finish with CA at all.
Funny that this should come up now - I turned the first stabilized blank in almost a year tonight. Going to Tokyo tomorrow and got a request for a "blue" pen. I picked out a dyed and stabilized blank from Ernie at BearToothWoods. I debated a minute after carrying it through 12000 MM and decide it sure would look better with CA, and sure enough it did.