High refresh takes power. It takes CPU/GPU power to generate each frame, and it takes display power to display each new frame. It’s a huge power suck. This is why the IIRC the Pixel wouldn’t run at advertised high refresh rate all the time, to save battery life.
Conversely, Apple made the Apple Watch display always on by cutting the refresh down to 1 Hz, one frame per second, when not in active use in order to conserve power.
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