Fiduciary duties relate to the professional responsibilities that an individual owes you while providing a service. For example, imagine a doctor is treating you for an illness. The doctor has a duty to provide treatments and medical services to you that are in alignment with your best interests and needs.
Many people think that if their attorney doesn't do things up to par that they don't have any way to rectify the situation. This is where many people are wrong -- legal malpractice is a very serious issue that does have legal ramifications.
Having a structure built is an expensive endeavor. When you pay for someone to do the job, you expect that it will be done properly. When the job isn't done properly, there is a chance that your structure won't be up to par.