If you take the issues of open-source and licensing out of the equation (both important issues in their own right, but not related to the point at hand) then Oracle and SQL Server are both ridiculously good.
I personally try to avoid them (due to the cost, and the lock-in) but they are astoundingly performant and featureful RDBMSs with a huge amount of support and documentation behind them.
I guess some took it personally, although I mentioned I do like Postgres.
I just happen to like the other ones even more, since I was lucky to be able to use them in a few projects.
2) "server side programming" - as you have the source code with Postgresql and their a plugins for most major programming languages I don't buy this.
3) If you of spent the same on Enterprisedb or CitusDB I can guarantee you would get similar polish and support. People don't.
It isn't a popular opinion on HN, but I will still advise for Oracle or SQL Server in terms of tooling, cluster scaling, server side programming and DB drivers.
Then again, we work with customers whose Oracle and SQL Server licenses costs aren't an issue.