Apple Music is the music as a service subscription that keeps pushing adverts in app and keeps turning itself back on even if you're not subscribed and have turned it off.
For a while there was a subtle difference in that music uploaded to Apple Music would have DRM applied to it, and iTunes Match would not, but this is no longer the case.
Wish there were more alternative mobile OSs and platforms. Apple is getting on my nerves too much lately.
Buying individual tracks or entire albums from the iTunes Store gets you DRM-free music files. No?
iTunes Match, which the author mentions, is responsible for exactly 1 of the features listed:
> Uploading your music to the cloud and streaming them as any other song
Everything else is part of Apple Music, the streaming service: https://en.wikipedia.org/wiki/Apple_Music
Match is just hidden legacy, because the standard subscription includes it's features anyway.
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.