There is big appetite for PostgreSQL in business cases. But there's also a lot of problems in PG and people want to solve them. But there's ~10 people in the core of PostgreSQL who contribute to it and know how to change the core. If you have a business use case that would require changing the core, doing it in safer, less error prone technology would be way better. That's why you have other products that had to be created that talk PG protocol, but aren't using official build.