Probate is a court proceeding. Nobody (except attorneys who do so for a fee) likes going to court.
It takes time. When we have to probate an estate, we usually tell clients to expect the process to take about a year.
You have no privacy. All the details of your will, your beneficiaries, your assets and expenses are public record for anyone, even a nebby neighbor, to do what they want.
It is expensive. In Pennsylvania, attorneys can charge a “reasonable fee” to go through probate. On a typical estate this “reasonable fee” is usually 3 to 7% of your gross (not net) estate.
AAPR did a study about probate and called it a “cash cow” for attorneys. The old attorney joke is how do you make a lot of money as an estate planning attorney? You write a lot of wills and outlive your clients. You cover you costs by writing wills. You make a lot of money when you probate an estate. For example, a reasonable fee in Pennsylvania on a $200,000 estate is $9,750. Why make an attorney $9,750 “beneficiary” of your estate?
Keep in mind that if Grandma had a condominium in Florida as well as her house in Pennsylvania, not only would she have an attorney and probate in Pennsylvania, she would have a second probate, a second set of attorneys and a second set of attorney fees in Florida. Two probates are not better than one. Two sets of attorney’s fees are not better than one.