I think most people like what they started with and got used to using. Brand loyalty with things like TVs cars etc is high because people are comfortable using them. Easy.
But in my trusted (by me) opinion Roon is by far the easiest to use, easiest to organize music between different streaming sources or hard drives, does the best job at selecting music for you, and super important, is portable between most streamers. So you can use Roon on an Aurender for example, have tons of playlists, bookmarks and favorites, and transfer it all seamlessly to an Auralic or Innuos or Antipodes or Pink Faun or Taiko. You can’t do that with any other proprietary app. I have or have Grimm MU1, Aurender N20, Auralic Aries and imbedded bridge in my Tambaqui. All can run Roon.
NowI am not saying Roon easily sounds better than say Conductor, but it can be optimized to sound great.
$500 for a lifetime of my music software is a deal to me. Roon is not perfect with their support philosophy or hardware, but it works for me!
An App that does not get in your way? That would be one that searches music easily across streaming sources, makes playlists and bookmarks across streaming sources, and recalls what you want quickly and easily. And it can serve streamers of different brands at the same time, say if you have a Bluesound in the bedroom and an Aurender in your reference system. That would be Roon.