I worked on software for phones and tablets right around the 2/3 split for Android, up through Android 5 or so. We had lots of testing devices of all quality levels. The joke-but-actually-100%-true around the office was that an Android tablet left unplugged on a desk over the weekend was always dead when you got back on Monday, while an iPad forgotten in a drawer for a month would have a useful amount of charge left on it (and come to life instantly, of course, as if it had never been asleep). Didn't seem to matter how much the Android device cost.
And it's not just designers; it's everything around user experience. For instance, both Terminal.app and the Apple bluetooth keyboard (when plugged into USB) have class-leading latency. That wasn't designers, but it probably also wasn't accidental.
Mind you, the Apple today arguably isn't as good at this stuff as the Apple of a decade or so, and they really fall down in some areas (Apple Music grumble mutter).
I remember reading at the time that, when idle, the chipset in many PC laptops used more power than the CPU...