I just want to quickly note that playing on a phone and playing on a Android TV box are really not that different. So when we work on improving one, we improve both.
Android might never offer the ultimate audiophile experience, but we can do our best to offer decent quality and a decent feature set. Ultimately, what good is a properly curated media library, filled with good audio and video, if you can't access it while traveling, visiting friends, etc?
I'll always prefer a HTPC to watch my video collection at home, but when I'm in the subway, visiting friends or family, I should have the ability to still watch or listen. Of course I could also watch something on Prime or Netflix, but if I'm in the middle of a show I'm binging, why should I not be able to continue!
On a technical note, improvements to video streaming will.largely be in MC itself which will benefit much more than just JRemote. It'll be usable by all remotes, for DLNA, and even offline transcoding.