Again, the "feature" as it is was not
detailed as it had to be (basically, slows down iPhones).
Release notes said precisely at the time: "iOS 10.2.1 includes bug fixes (...) It also improves power management during peak workloads to avoid unexpected shutdowns on iPhone". here
It's not a like/not like issue. It's incomplete and misleading information from Apple leading people not knowing why their iPhone is slow, slowness that might be fixed thanks to a battery change.
What I don't like, though, it's people here spreading the wrong information.