Prime Video Uses WebAssembly
I'd be happy with surround (5.1) upon windows, alas it seems you can only get that via an Amazon device.  HD 5.1 would suit me over any 4k and do feel many streaming services use the 4k etc as marketing more than anything else and fail upon the audio aspect in regards to surround, which IMHO add's way more to the viewing experience than a bump in resolution - though others millage may vary.