Two reasons, I think: * there isn't a general method of starting from a query plan and verifying it aligns to a particular query, which means you're very much

Two reasons, I think: * there isn't a general method of starting from a query plan and verifying it aligns to a particular query, which means you're very much on your own if you try to change it to something Postgres has not (or maybe cannot) generate * there is no "ABI guarantee" on query plans, so you're locked into a particular build