Did the Church REMOVE the DOCTRINE from the D&C?!

Answer: Yes. According to the first and subsequent editions of the D&C (up to 1921), the Church admittedly did so. The lectures on faith was considered the doctrine and the revelations were the covenants (and commandments). Though I could argue that the revelations in the D&C contain eternal truths and doctrines, it's still a shame to have removed the lectures as they are "profitable for doctrine and instruction" - the Church's own words describing them.