Expected. Still much, much better security than no code at all. I will use it (with full knowledge of its downsides and tradeoffs) and it would behoove the CCC to not portray security as a binary state. (Just as much as it would behoove Apple to be truthful in their marketing.)

Don't use it if thieves would consider going through all the effort of faking out the scanner. That's what I take from this no doubt valuable and important work from the CCC.

(I assume that iPhone tracking and activation lock cannot be disabled with the fingerprint, so stolen phones will still be easily remotely wiped and bricked, with fingerprint or without. Thieves will have to be crafty and quick if the want to pull this off.)