Star Trek: Discovery is a modern TV show and yet it's produced in 2K HDR. Yes, HDR makes it beautiful, but I don't find it as detailed as 4K videos.
Why isn't Star Trek: Discovery produced in 4K HDR?
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It was made for a channel that doesn't support 4K
Star Trek:Discovery was originally made for CBS All Access, although it's on Netflix in many countries outside of the USA. Unlike Netflix, Amazon Prime, and many other streaming services, CBS All Access does not support 4K streams and, if internet reports on its quality are to be believed, appears to run its streams at much lower bandwidth even in normal HD.
Since it was made specifically for a service that doesn't support 4K, the producers could save money by using cameras and CGI targetted at a lower resolution.
Note that the show was intended to be broadcast on its own internet streaming channel, so having the show be in 4K (or 8K) is basically unnecessary since the average viewer couldn't possibly tell the difference.