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).
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.
Sorry, that's incorrect. Shortcuts are available independent of Siri being enabled - I've just checked this by disabling Siri on my phone.
I've disabled Siri on my phone and watch because I never use it and there's a massive battery improvement when I disable it; the old Workflow app used to work without Siri, but Shourtcut requires it apparently :(