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> and today we have Citus.

After reading this, I have been wondering if the other requests/ideas are not startup ideas

I'm sure some of them are. And Citus is not the only startup pushing PostgreSQL in a way the community did not want to.

If you look at https://wiki.postgresql.org/wiki/PostgreSQL_derived_database..., it's a pretty long list - some of the product are successful, some are dead. And then there are products adding some extra sauce on top of PostgreSQL (e.g. timescaleDB).