What are the advantages of a vault? (funeral)

Really other then what you list there is not really any other .Unless your are going to open or move a casket there is really no need for a vault .I did buy a vault for both my parents graves I think they get you because the idea of your loved ones casket breaking at that time hurts .I think later you think about it and preserving a casket forever does not matter as much vaults don't last forever one day they well fail and what difference well it really make ?I think some places require vaults but if not required I don't see the need .