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> seems cool about it, too.

How people blog and how they feel aren't always the same thing. Professionals tend to be a lot more tactful in public communication.

I would be fuming if I were an engineer depending on that, but obviously in a public communication like that, where you are explaining to clients why you charged them erroneously, just pointing a finger and acting mad makes you look like you don't have control of your own software.

A little bit of passive aggressive comments would have been appropriate I think.

Maybe I’m just projecting, but to me the author seems deeply bothered and holding it together to write the most effective takedown of the gem’s developers.

Yep, that gets a pin to "==x.y.z # pinned to prevent BREAKING CHANGE, do not update without reading <link>" and also some defensive regression tests on their api lest someone update by mistake.