The good folks at K definitely want to provide us with the best soundtrack, but they are unfortunately at the mercy of the studios and what files they provide to K. And while the Atmos tracks often make it to the Store a week or two after release, I'd argue that most of the lossless 5.1/7.1 mixes K offers up front are still superior to the lossy Atmos tracks on many of the streaming services.
Andy
Andy