Apart from being able to unlock my iPhone with a mask on, for me, the most compelling feature of this week’s 14.5 updates is something I did not expect: color balance.
I thought that the picture on my TV was just fine. Then I did the calibration. My TV’s picture definitely had not been fine before. 
It works great. And I would love to have it available to me on my Macs. Especially for the Mac Mini with its external 3rd party display. I do own old versions of the SpyderX devices, but I got tired of their ongoing policy of not supporting their calibration devices very long and the software is not that great.
I am sure that a dedicated device for color calibration might do a better job, but Apple’s new calibration feature in tvOS in combination with an iPhone is a real pleasure to use and it can be done in an instant. It is better that nothing and I think that many of us are looking at screens that do not provide us with an optimal picture.
EDIT: Feature request submitted to Apple. 