What you described is pretty similar to my experience.

I wonder if part of the author's sentiment about it being more widely deployed can be explained in part by stack overflow trends data.

Basically, MySQL used to make up a much larger % of questions on the site (compared to postgres). But postgres had been growing, and MySQL shrinking, so now they're about the same on the site.

https://insights.stackoverflow.com/trends?tags=mysql%2Cpostg...