I believe you are the one who need to reread the thread. The person I replied to claimed that "Postgresql upgrades are a piece of cake."
But it is not. It's complex to do properly, just like with most if not all other databases. Claiming that it is easy as is just ignorant and spreading such misinformation is bad.
I never claimed it's easy, I just said get a managed pg, offload it to someone else and then it's easy yeah. I'm wondering the same as other commentator above me, what's the difference in other unmanaged dbs?