Something I really appreciate about PostgreSQL is that features don't land in a release until they are rock solid. I don't think it's that nobody thought of it

Something I really appreciate about PostgreSQL is that features don't land in a release until they are rock solid. I don't think it's that nobody thought of it for PostgreSQL - I think it's that making sure it worked completely reliably across the entire scope of existing PostgreSQL features to their level of required quality took a bunch of effort.