Brian it is a good question and I am totally agree with you. First of for I wanna to share my feeling on it. I am the RC onwer of T6C. After the briefly observation of the RC's floor plan most of my friends included me also feel that it is a strange design of the side wall which is used to seperated between big and small rooms. (There is no such as this problem on the flat A and H).
Up to now I am still thinking of the treatment of changing wall which is depended on my budget. However if you don't mind that I would to like to be included on the question. Thank you.