I mentioned in the TV thread that 4k was a bit of a mistake to adopt so quickly. We basically skipped 1440p on the way to 2160p/4k marketing nonsense without any real thought about what handling true 4k would take. Every step to handle and process a video signal is so much tougher when you have to push a huge amount of extra pixels at 60 frames a second for sports. Then you have the people at home who have "4k" cable or streaming boxes but in reality it's always down-sampled to something manageable for the system. True 4k broadcast signals are still a pipe dream.
I can understand why cable companies are hesitant to support it too, since they'd probably need fibre optic cables to every house to pull it off.
That being said, there's no excuse for the lack of 1080p60 sports broadcast signals today both on cable and streaming. Gene Principe tweeted a picture earlier this season of their broadcast monitor zoomed in on a player, and it showed that they were filming in 1080p60. It's being downscaled to 720p60 for cable and Sportsnet Now.
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