I think some people have missed a few posts over the last few months (easy to do!) - while The Chinese Room did develop the game it was with Frictional's advice and guidance when required. Also, when TCR delivered the final game to Frictional there was more than just testing involved; tweaks were made by Frictional, some gameplay elements apparently changed and, if my memory is correct, Frictional even swapped around some of the ending sequence.
All gameplay decisions will have been fully 'approved' by Frictional and, from what I've seen of the first 30 mins of gameplay, everyone has done a magnificent job. So stop worrying about a 'lack' interactivity, there are plenty of objects for you to pick up and throw around (or dangle in front of you while walking if that pleases you).