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Once it's present across the lineup, do you think it will retard the Hackintosh community's progress?

Just depends if it ever becomes non optional.
They continue to make all of these sorts of things optional to enable on macOS.

I could envision there being features that might become unusable on non Apple hardware in that future though. Perhaps built in FaceID types of things. I think that's the sort of thing they are laying the ground work for on macOS.
 
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