the question is why would we need this security on the forum? Many guys would like to check some news immediately instead of digging out the cellphone for the code. I think its an overhead that would block the flow of communication.
In the other view of course we would like to put everything into a safe to make us fell save.
Because an old bitcointalk account has considerably high value now, and those trusted accounts could be used to scam a considerably amount of money if it has been hacked.
If you just want to check the news, you probably don't need to log in.