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There is no way you can remember 12 words for years to come without writing them somewhere. Which also means that they could easily be stolen or lost.
true but as i explained, the alternative is still flawed so in my opinion storing the 12 words that is randomly generated is a lot safer than using a brainwallet even if it is susceptible to physical theft.
besides you can mitigate that by using some sort of encryption on it! for instance you could use the "brainwallet" as the password for encrypting the mnemonic phrase and then print the encrypted text instead and remember the password.