Knife edge flight is part of pattern. Hovering, flat spins and other high G maneuvers are 3D.

It seems if looking at all the pattern planes they all look alike but it is the sublte differences that make them unique. they are designed to track straight and true in any attitude, upright or inverted, the control surface movements are very small compared to 3d
planes.

Pattern isn't all about competition there are many pilots who use pattern as away to hone their skills without competing. As pattern is a precision form of aerobatics every manuever must be executed perfectly and when done well it is an awe inspiring type of flying to watch. Boring from what some people tell me.