You guys seem to be missing the point.
LBK is stating what "should" be the norm. Why bother teaching something that is below par?
Yes, clergy and bishops might not be saved, however, the Church teaches what is expected of them, and prays and expects that they SHOULD meet their obligations and be saved.
Same with all of us. Just because "we" aren't disciplined enough in following the rules, canons, laws, recommendations, of the Church in order to hopefully, through the Grace of God, achieve salvation....doesn't mean the Church should lower her standards and teach something "less".
Same with icons. Certainly not all icons are created in a prayerful atmosphere, with prayers constantly on the lips of the iconographer, nor are they fasting, and they might not even be using tempera paints.....
However, the proper way to write/paint an icon should still be taught.