Because it's very easy to get things wrong or cause foot guns for the user. The Postgres core team tends to err on the side of delay (or outright rejection) rat

Because it's very easy to get things wrong or cause foot guns for the user. The Postgres core team tends to err on the side of delay (or outright rejection) rather than release a feature that could lead to data loss. https://www.mssqltips.com/sqlservertip/3074/use-caution-with-sql-servers-merge-statement/ https://www.mssqltips.com/sqlservertip/3074/use-caution-with...