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I've been using YouTube dark mode since it was enabled on my X. Can't say whether it reduces battery use, but it is easier to look at, especially at night. As others have noted, I do shift to Smart Invert if I'm reading on my X in the middle of the night, as I often do. In part it's easier on my eyes and doesn't wake my wife from the otherwise bright yellowish light.
DED, your note about the stainless steel band on the 8 is incorrect..."In particular, the new iPhone 8 features distinctive styling springing from its new polished stainless steel case design, set apart with its glossy frosted glass back, available in three colors.", as the stainless steel is only available on the X, with the 8 carrying over with the 7000 series aluminum. For most people, that's not going to be a dealbreaker, as the strength benefit of the steel vs aluminum won't matter in these applications.