The Importance of Covering Lines

I looked at courses that are obviously high quality and generally very well received. But sometimes there is the criticism that because the player presenting is very strong, they tend to focus a bit more on lines that are critical to them. If I'm presenting the night earth, I might go very much into the detail of the English attack or Bishop G5. Just as likely if you're playing at a level that varies between 1,200 to 1,800, so a wide variety of players. Those players could see a majority of Grand Prix attack, close to Cillian. Even whatever D4 and C3 is called, what's that gamut called? D 4 and C3? No,