There are so many concerns you have to face as the executor of an estate that it can be easy to overlook certain details. For example, an executor could miss assets hidden in unusual places if they don't confirm with family members. They could also fail to consider possible complications to the estate, such as one or more family members attempting to illegally retain assets against the wishes of the testator.
The family home can sometimes be a major source of conflict in an estate. Perhaps it represented a substantial amount of money, so the testator wants you to sell it. However, the members of the family would prefer to retain it and do not have an interest in purchasing it when you list it for its fair market value.