2FA works just fine , but if you want to stop using TrustedCoin for one reason or another , or they got hacked or something , then you can use the seed to recover your wallet .
Note: The restore option should be used only if you no longer want to use TrustedCoin, or if there is a problem with the service. Once you have restored your wallet in this way, two of three factors are on your machine, negating the special protection of this type of wallet.
I personally see it good that way , imagine the amount of people that will be damaged if TrustedCoin goes down or get hacked ?