I have been using the capability to copy (create) people from RootsFinder to FamilySearch to save retyping. However, it is quite variable. Sometimes the date of birth is added correctly but no death date, sometimes the death date but no birth date.
I just did 3 children in one family, first one created the birthdate but not death date, second one the death date but no birth date, 3rd one the same as the first. I then have to go through each person and migrate the missing information.