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I worked at Google; I'm describing to you exactly how the infrastructure worked.

Yes, Google's internal infrastructure is that good. It's easy to get caught up in the "haha cancel products" meme and forget that this company does some serious engineering.

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What Google does with its internal infrastructure is of limited applicability to the majority of people, where interface stability is the prime directive.

Interface stability and "living at head" are not mutually exclusive?

They are not. A good interface rarely ever needs to be changed; the point of live at head is that it's impossible to commit a breaking change as long as there's a test depending on the thing you broke.

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