> the GP comment claimed upgrading PG was a piece of cake. You claim it is not a piece of cake. So it sounds like you agree that the claim that upgrading PG was a piece of cake was misleading.

GP claimed upgrading was a piece of cake, not that zero downtime upgrades are a piece of cake. The two claims aren’t interchangeable. The simple upgrade path is always available, though it may have downtime consequences you personally are unwilling to accept. And the complex upgrade path is complex for reasons that have nothing to do with PostgreSQL - it’s just as complex to do a zero downtime upgrade in any data store, because in all cases it requires logical replication.

So if anything it feels like you’re the one being misleading by acting as though GP made a more specific claim than they actually did, and insisting that the hard case is hard because of PG instead of difficulty that’s inherent to the zero downtime requirement.