Why don't they release new Tv shows on 4K Discs?

[Geoff D]

Originally Posted by LexInHD

Only a handful of new US shows on streaming services get filmed and finished in 4K, while pretty much everything else is HD, so there's no real content source to expand the UHD-BD offerings. The only market where a 4K TV production is commonplace is Asia, where 4K broadcast and streaming infrastructure, production, and adoption were far ahead of the US and other markets for some time, pushing them to make a lot of 4K content. Ironically, much of that content doesn't get released on media above DVD and is mostly streamed to viewers, with the occasional Blu-Ray release. Now, they are working on pushing 8K content production and broadcasting.

Netflix have had a stipulation in place for years that ALL content made for their platform should be shot on and finished in 4K, even the CG. But why does something have to be finished in 4K in order for it to be considered a UHD candidate?