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Interesting comment on the battery impact of Siri. Did you notice improvements when you turned off Siri entirely or just the "Hey Siri" functionality? I find it quite odd that Siri would take up battery even when not running (given that "Hey Siri" is disabled).

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I haven't tried partially disabling Siri (always completed disabled it or fully enabled everything), but I thought the "Hey Siri" feature worked only when plugged in? Maybe I'm confusing it with a different feature.

That was an iOS9 limitation.

That was a phone limitation. The iPhone 7 had the hardware for always on listening.

Ah that must be it. I have an iPhone 6.

My 6S+ supports this as well.

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