I think it's largely a question of community. Many users of MS SQL or Oracle learned advanced SQL or platform-specific features which they take for granted. Th

I think it's largely a question of community. Many users of MS SQL or Oracle learned advanced SQL or platform-specific features which they take for granted. They work at companies that spend lots of money for DBs and hire people who use them very well. Postgres also has a core community of very knowledgeable folks. But most of its user base, and especially those new to using it, would otherwise use MySQL. They only know small bits of SQL, have only a basic understanding of why any company would need a DBA, and only learn things like this when they absolutely need them for a task. And, for that group of people, MS and Oracle probably aren't serious choices, so the fact that a free database has these cool features seems exciting to them. (Note that I don't say this with distain. I'm a former-mysql user who now uses postgres on Heroku and am constantly learning things like this. I wouldn't even have understood your perspective until I started working with people who knew Oracle and MS SQL so thoroughly.)