> Additionally, users can now see if the power management feature that dynamically manages maximum performance to prevent unexpected shutdowns, first introduced in iOS 10.2.1, is on and can choose to turn it off. This feature can be found in Settings -> Battery and is available for iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 6s, iPhone 6s Plus, iPhone 7 and iPhone 7 Plus.
I believe Apple has stated they don't ever throttle the CPU on their current generation iPhones, i.e., they wait until they've been out for a full year and replaced by the next generation.
Why only those models? What about the 8 and X?