We generally assume our discussion style of teaching follows the Doctrine and Covenants, namely D&C 88:122: "Appoint among yourselves a teacher, and let not all be spokesmen at once; but let one speak at a time and let all listen unto his sayings, that when all have spoken that all may be edified of all, and that every man may have an equal privilege." So we all get to talk, but we don't all speak at once (usually). So far, so good. But what about the previous four verses?
118 And as all have not faith, seek ye diligently and teach one another words of wisdom; yea, seek ye out of the best books words of wisdom; seek learning, even by study and also by faith.
119 Organize yourselves; prepare every needful thing; and establish a house, even a house of prayer, a house of fasting, a house of faith, a house of learning, a house of glory, a house of order, a house of God;
120 That your incomings may be in the name of the Lord; that your outgoings may be in the name of the Lord; that all your salutations may be in the name of the Lord, with uplifted hands unto the Most High.
121 Therefore, cease from all your light speeches, from all laughter, from all your lustful desires, from all your pride and light-mindedness, and from all your wicked doings.
Perhaps we can't expect to get much from Church lessons or the manuals written for them until we've sought diligently by learning and by faith, organized and prepared ourselves, entered the Lord's house in his name with uplifted hands, and ceased from our light speeches, laughter, lustful desires, pride, light-mindedness, and wickedness.