before the testator dies.
Not a TAAT but so many times in RL and on MN I have heard about wills which do the opposite of what was intended or which make assumptions about who should/should not benefit from an estate.
If the will was public then any potentially interested person could read the will. If they dont agree with it then they can raise it with the testator.
As wills are often made many years before the testator dies clauses which seemed perfectly fair at the time can become out of date (eg leaving an estate to named grandchildren can seem like a nice thing until a late arriving grandchild is born and not being named is effectively disinherited).
The testator has to own the decisions they have made rather than leave the executor to deal with everything whe there is nothing they can do to change things.