When I started teaching English in Japan, I think the students got some good communication time with me. I had no idea how to teach, even less Japanese ability and so what I did was talk to the students. And without any idea of what they had studied so far. During warmup Q&A's, the class teacher would often tell me "Sorry, they haven't studied that grammar yet."
Later, I learnt how to "teach" and that communication time went out the window. Perhaps students were better equipped to answer test questions but that's not communication.
My teaching style has changed so much over the years it has come almost full circle and I now see that what I was doing in the beginning might have been quite beneficial. Now I "teach", but I also try to give the students as much chance as possible to communicate as well.