Along the lines of Scully's comment, I was once in a home with another jw as the householder invited us in. After a chat, he offered me a book from his religion. Of course, jws are not really allowed to accept literature from others. But, it felt wrong and bothered me not to accept because, after all, I was trying to place literature with him. If it had not been for the other jw there, I'd have accepted it. But, I was actually afraid she'd go to the elders and report me for accepting.
Also, when I was an elder, I often felt that there were things i'd like to say, and more compassion I wanted to show, but with another elder there, I could not risk speaking even slightly askew of the 'party line'.
I understand why there may be some valid reasons for the 2x2 method, and also that Jesus sent his followers out that way, but it does create a certain atmosphere that is not conducive to real openness in some situations.