The entire thing is written in a curmudgeonly fashion, led by that massive list of musicians.
We get it, you like classical music and Spotify is a poor fit. That's... the article?
It's not a long article, and is quite amusing to read. People have such high expectation of free articles on the internet.
For my classical music use case, listening to new releases, Spotify works very well, particularly with the help of 3rd-party services.
I follow several thousand composers and musicians. I then get daily playlist creation by crabhands.com of any new releases by those I follow. I then export the crabhand playlist into my own local database via exportify.net. I then create Spotify playlists of music I haven't heard that I may like as well as the released works I like best. Then I score the works I've listened to and feed that back into the system. So I get a deluge of new releases but play it in an organized fashion.