I have something similar with Kodi and Kore remote app, it's convenient for searching a media and yes for volume and next song, but for browsing movies on screen and navigating options using arrows, it's a pain, I always end up click on another button or just in a blank space, and have to look at my phone and back at the screen.

Also if you have kids, you definitely don't want them to use your phone to choose their cartoons.