That has not been my experience at all. The sysadmins I have worked with have strongly preferred PostgreSQL over running MySQL while the developers have cared, but less so. The reason is that when something goes wrong PostgreSQL is much easier to diagnose. So while some tasks like upgrades take less manual effort with MySQL PostgreSQL is more stable and gives better error messages for when you get paged in the middle of the night.

PostgreSQL has prioritized correctness and stability which while it has made certain features more clunky to use or taken longer time for them to be implemented, when you get paged n the middle of the night you get the time you spent back. PostgreSQL also has spent a lot of time on improving DBA experience so mixed DBA/sysadmins also usually prefer PG.