What I like about roon is the new music it leads me to (with a subscription to Qobuz or Tidal). When you play an album it will offer suggestions of other albums you may like. It can also learn your tastes by you liking or disliking songs on roon radio (plays tracks after your album is over, if you want it to). There are other ways to explore music also. With a million or so albums to choose from, you can find a lot of good music and you don't have to buy anything to try it.
If you know what you want to listen to many other apps will do the job. If you like to find new music, roon is worth a try.