Comment by spudlyo

I have a lot of respect for Postgres' massive feature set, and how easy it is to immediately put to use, but I don't care for the care and feeding of it, especially dealing with upgrades, vacuuming, and maintaining replication chains.

Once upon a time, logical replication wasn't a thing, and upgrading major versions was a nightmare, as all databases in the chain had to be on the same major version. Upgrading big databases took days because you had to dump and restore. The MVCC bloat and VACCUM problem was such a pain in the ass, whereas with MySQL I rarely had any problems with InnoDB purge threads not able to keep up with garbage collecting historical row versions.

Lots of these problems are mitigated now, but the scars still sometimes itch.