Okay I've tried to use Moonlight today. It appears much more broken than Steam Link. There is no working autostart (but there is a broken service option), audio doesn't work, credentials sometimes just break to the point that a fresh start is needed, there is no way to elegantly exit the app, and it doesn't add the ability to unlock the PC (in fact, it even is so fragile that it requires a restart of the host program if the computer's primary display has turned off).
The options are nice and it sounds great on paper, but Steam Link is a better solution right now.
The options are nice and it sounds great on paper, but Steam Link is a better solution right now.