I have now.
Tell me, how is that code used?
Because, and tell me if I am wrong:
I can send NXT from my wallet to any other wallet by inputting ONLY their 18/19/20 digit wallet key.
Anyone that can open their wallet that has that same 18/19/20 digit wallet key has access to those NXT.
Anyone that has access to those coins can move / spend those coins?
Each time a node sees a transaction it checks if it's the first time a public key used. If yes, then soft remembers this key, so next user with the same account id will get all transactions rejected.
As I said everything in Nxt is made on purpose. For example, brainwallet is used to protect users against
Key disclosure law. Such strange method of getting an account id is made intentionally to protect ordinary people from government. How it's supposed to work is still waiting to be revealed.