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Note that the postgres core team aren't all developing postgres itself, and that there's a vastly larger number of people working on postgres than the core team. They're basically "just" a body to escalate things to.

It's always pretty shocking. You even see it at big companies where you'll only have a few engineers working on the core product and then a ton of people working on supporting infrastructure (analytics, marketing and what have you) around them.

Pareto's Principle arises everywhere.