Intel stipulated the same under the name HUGI (Hurry Up and Go Idle) about 15 years ago when ultrabooks were the new hot thing.
But when Apple says it, software devs actually listen.
Apple was talking about batching tasks for battery life back when they shipped Grand Central Dispatch back in 2009. It was a major part of that year's WWDC keynote. Race to Zero was also a major part of how they designed networking for iOS.
Peer pressure. When everybody else does it and you don't, your app sticks out like a sore thumb and makes users unhappy.
The other aspect of it is that paid software is more prevalent in macOS land, and the prices are generally higher than on Windows. But the flip side of that is that user feedback is taken more seriously.
And then Microsoft adds an animated news tracker to the left corner of the start bar, making sure the cpu never gets to idle.
it least on mobile platform apple advocate the other way with race to sleep - do calculation as fast as you can with powerful cores so that whole chip can go back to sleep earlier and more often take naps.