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Windows seems to happen as a bottom-up thing. Feature teams conceive, design, and implement features, and a bunch are put together and shipped. Thus, any top-down view will be necessarily meaningless until the details float in from the teams actually doing the work.

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At the same time, you need some top-down direction. You can't just tell a team of thousands of engineers to go build something, and expect it all to have a unifying theme, and work well together.

It works well for small teams, but breaks down pretty quickly as team size grows.

Now much is explained.

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