I had toyed with the idea of using a TV as a monitor on a couple of different occasions in the past decade with no success, but with the advent of affordable 4K sets using a TV as a desktop monitor is finally feasible. Here's my experience during the past few months.
Apple iTunes received an update today adding support for the new TV app on iPhone, iPad and Apple TV. On the Mac front, it improves Touch Bar support on the new MacBook Pros to use the scrubber to easily go to different parts of songs and movies. It also includes minor app and performance improvements. You can download it for Windows and macOS.