Agreed. It was and has always been "strongly implied" that a DF person sit at the back.
Sure, it may not be an official directive, but it is indeed what is encouraged.
I saw a DF brother once just sit mid way down the auditorium, and the way he was harassed by elders after just proved it. The the elders made it known in conversations over the next few weeks that he was "acting in a brazen manner"