Great article, shows a lot of interesting PostgreSQL features. I have used PostgreSQL and MySQL for decades, and this article showed me that I have barely scratched the surface of what is possible.
PostgreSQL is like Emacs. It's an operating system disguised as something else.
I've used Postgres for more than a decade and everytime I wade into the docs I feel the same way, I'm barely scratching the surface. It's so immensely powerful.