Why don't people upgrade? Why don't we ask why upgrading is necessary? I understand that Postgres is free software, and if you choose to use it, you're signing

Why don't people upgrade? Why don't we ask why upgrading is necessary? I understand that Postgres is free software, and if you choose to use it, you're signing up for whatever upgrade cadence the developers give you. But really, I with the developers would spend a bit more time patching "old" versions. 6 years is really too short a time to have to do an upgrade, especially if you have many database servers.