WBS does have its pros and cons. However, I feel that the biggest pitfall in this case could be having to do with multiple task all at once.The goal is to break down all tasks so that you can compete the project easily. However like we have learned, other priorities come in the way, the problem is that the your coworkers could end up spending a lot of time on the smaller tasks. This could consume a lot of time your managers are required to track of all the task. This could get put your main work on delay and also achieve poor results.