Linked from
The 9 pages that link to Bouldering, each with the reason it gives.
Rock climbingBroader topic: It reduces climbing to short, powerful problems close to the ground.
Sport climbingCompared with: It removes the rope and bolts used on sport routes.
Lead climbingCompared with: Bouldering uses neither a lead rope nor intermediate protection.
Climbing wallRelated: Bouldering walls use low, steep problems and padded landing areas.