All are lighter and easier to place than fixed bolts. The most common reason climbers cite for not using RB anchors is that the small holes are more difficult to see than a fixed bolt is. This growing attitude is partly influenced by people introduced to climbing through indoor climbing gyms. Other climbers prefer a natural and uncrowded setting. This attitude is largely influenced by people introduced to climbing by individuals with a common commitment to preserving the natural and peaceful setting of climbing areas.
Camouflaged anchors are harder to see and nonexistent anchors are impossible to see.
People are still leaving the same gear behind, whether it is a nylon sling or a bolt. But a brown sling is better than a pink sling and a gray hanger is better than a chrome hanger because they are harder to see. Again, it is the visual affect of the fixed anchor that prompts all of this. The American climbing community has a long history of advocating, using and enforcing the use of the least visually intrusive anchoring technology and techniques widely available to them at the time. If we did not, it would cause big problems.