The days and months after a car accident can be difficult for someone with serious injuries. You are hurting. You are dealing with doctor appointments and medical bills. Maybe you hire an attorney to help with your claim.
If you hire an attorney to deal with the insurance company, you may not be familiar with the behind the scenes process. However, the personal injury demand letter is an important part of the process. Trust me, the quality of those letters (and often the amount of your later settlement) can vary tremendously between lawyers.