No reason you can't use that anchor, but it has some drawbacks. It is true that it allows the most efficient use of your back muscles: back tension and a clean release are easier to get with that anchor than with a higher one. However, it will make it very difficult to shoot either instinctively or with a gap method because the arrow is so far from your eye; the gaps become literally huge at normal ranges. Oly archers have sights, and they shoot at very long ranges, so this anchor is perfect for them. Without sights, unless you are shooting longe targets on a field range, I don't recommend this anchor point. I could see it used in conjunction with other anchor points for field/target shooting, but not as your main anchor point.