Or, alternately, it took them 39 builds to get the functionality working as expected.

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Don't mind, this is all just lighthearted, but we forum members would
probably consider as a Christmas present that occasion when the home button delay issue stops getting raised every new thread.
While a lot of us feel it to be a bug, a bug, for all Apple cares, is something that is not working as "they" expect it to. It is clear that Apple intends the home button to work this way in iOS 11, therefore, stands to reason that it will most likely never be resolved for those amongst us who have had the pleasure to experience a near-instant home button on iOS 10.
Nothing can be done about it.