Done right by a lawyer, your heirs can avoid the expense and time of probating your will and may save on estate taxes, while easing the administration of your affairs while alive and after you have gone.
Remember that a will goes through probate, so a husband and wife typically try to avoid it by using joint ownership or beneficiary designations. However, they’re often mistaken by believing the will still controls their estate.
Most people wish to have more control over who and how their assets are managed than what the state laws provide, and so they draft documents that can override the Laws of Intestacy, when those laws do not match their objectives.
My daughter, my only child, recently married a nice man. However, he is not responsible with his finances. I don’t want my son-in-law to have any access to her money or through a divorce via equitable distribution.