Issue is not Roon, it is Apple, Amazon, Spotify, etc. They don't have an open API that allows Roon to work. Spotify has Spotify connect, Amazon has selectively worked with a few large partners, no idea about Apple.

Who has Amazon partnered with? One of (if not the primary) reasons I will not use the service is there is nothing out there that is capable (other than one of the Amazon "toys") to run their music remotely. Given the consumer bias Amazon promotes, I dont think we'll see the like of Lumin, et.al. with an app to control the service etc.
Lossless is not possible. Close if masters were digital, but analog masters, NO way. Just my opinion...
Is their audience those that listen in their Apple device with Apple earbuds?
until we can stream it natively on all the popular streamers, it’s just a misuse of bandwidth. 
Amazon licensed it to Paradigm or whatever they are calling themselves these days (NAD, Paradigm, Bluesound, etc.)   Otherwise you need to hang a DAC off a laptop/PC.
fiesta75
Lossless is not possible. Close if masters were digital, but analog masters, NO way. Just my opinion...
Huh? It is trivially easy to make a bit perfect copy of any digital file, and that's the definition of "lossless."

As for making a digital copy of an analog master: I encourage you to experiment for yourself sometime. Many have been surprised by the results.