What is the primary disadvantage of a traction rappel?

The primary disadvantage of a traction rappel lies in its method of operation, which does not allow the rope to be wrapped around the body. This is significant because the wrapping of the rope enables the user to create a friction hold that can help control descent and provide stability while rappelling. In situations where more control or friction is desired, such as descending steeper or more challenging terrain, the inability to wrap the rope around the body can limit the rappel technique's effectiveness.

While the other options enumerate potential considerations, they are not as directly related to the operational mechanics of a traction rappel. For example, time consumption may vary depending on the user's skill level and the specific situation, and additional equipment may be needed, but that pertains more to setup than to the fundamental nature of the rappel itself. The safety of beginners can be a concern for all rappel types, but it is particularly relevant when discussing the methods used for descent control rather than an inherent flaw of the traction rappel operation.