Google explains when it slows down the Pixel 4's Smooth Display
 

Google just unveiled the Pixel 4 and 4 XL, and it's already got a lot of explaining to do. In addition to announcing a fix for Face Unlock that would make eye-detection necessary, the company also had to clarify today that the phone's Smooth Display...

https://www.engadget.com/2019/10/23/...0-hz-vs-60-hz/