The way I understand it and correct me if I'm wrong, but as shin_lao pointed out above: "Full drive encryption is meant to protect against theft or loss, not against trojan horses (be that hardware or software)."

This is a good point with regard to the Maid scenario, so I don't think the developers of TC were running away from the question at all.

And from the article: "After some 1-2 minutes, the target's laptop gets infected with Evil Maid Sniffer that will record the disk encryption passphrase when the user enters it next time." -- so the attacker is depending on the user reentering the system, and they are depending on confiscating the system afterwards. Loss and theft scenarios where an attacker has not utilized EMS, or is just out to steal the laptop, still protects the data.

So in summation, you need encryption to protect against loss or theft, which may be sufficient for your vulnerability level (maybe you don't travel a lot but one day you simply lost your laptop), but you need to go further to protect against what looks to me to be a more advanced version of a keylogger (EMS - frequent traveler with sensitive information).