I think this is because most PostgreSQL professionals use the command line tools, especially psql, which is miles ahead of any command line tools the competitio

I think this is because most PostgreSQL professionals use the command line tools, especially psql, which is miles ahead of any command line tools the competition has. And when the experts do not use the GUI tools there will not be any feedback from people who know what a UI for a database must be able to perform. It is a chicken and the egg problem.