[cassianoleal]

Apps != Services. The Music app is the main front end of Apple Music and iTunes Match, but you absolutely do not require a subscription to them in order to benefit from the app, and vice-versa.

Edit: I think I understand your point better now. I've just learned that Match is not necessary if you already subscribe to Apple Music. I still wouldn't call it legacy though, since you might just want to sync music you own between devices and don't need the rest of the service. In this case, Match is a lot cheaper than Music.