Once a person dies they are judged by God. Either they are adjudged as righteous or not. It has nothing to do with what someone may do later (posthumous baptisms, etc).
As a thought experiment, if the posthumous baptisms worked, one LDS sect could baptize person A allowing him to be in the afterlife with LDS family B. But then a competing LDS sect could later baptize person A. But if the second sect is anathema to the first, person A might suddenly be no longer able to be in the afterlife with LDS family B.
The Vatican needs to look at its own scriptures and doctrine for assurance that such things are meaningless to God.
“The Vatican needs to look at its own scriptures and doctrine for assurance that such things are meaningless to God.”
Meanlingless to God, yes, but to the families of the deceased there is a line of respect. In genealogy, a rule of thumb is 100 years from date of birth before releasing records. The US Census waits 70 years.
As far as the posthumus baptisms, the Catholic church has an obligation to refrain from appearance of scandal. A Catholic giving records for Mormon baptisms is like a Catholic attending a gay wedding. It suggests an approval that is not there.
If baptism is meaningless, then why did Jesus Christ seek out John the Baptist? Why was Jesus filled with the Holy Spirit after that baptism?