> xyz [4K/UHD]
4K is not available when using a computer
> HD is not available because you're not using Windows
when using Windows
> HD is not available because you don't have HDCP
Graphics driver begs to differ.
Prime SD is usually somewhere between 240p and 320p, HD looks like a decently encoded 720p file. Never seen it but I'm guessing 4K might actually approach the quality of a 2007 Blu-Ray.
Apple TV has been the best platform so far for 4K and Atmos content, if you also want an option to purchase a title.
https://www.highdefdigest.com/news/show/everything-on-amazon...
Netflix, Disney, and Apple are great.
HboMax has 4k content, but their tech is really bad and the quality is constantly jumping between SD to 720p to 1080p to 4k. We have a 500Mbps fiber connection.
Streaming platform usually only give you 5.1 on EAC3 (DD+), on UHD Blu-rays you get 7.1 over TrueHD, and then you get Atmos on top of both of those, and Atmos over TrueHD is more Atmosy or something (besides obviously TrueHD being lossless while EAC3 is lossy.)
Some soundbars such as Samsung Q950T/Q950A send the sound to all speakers either 9.1.4 or 11.1.4 respectively.
But you are quite right that discs offer the best quality.