Is that a good thing? One of the benefits to streaming for me is precisely that I don't want to get stuck being an old guy who just listens to music from when I was a teenager/young adult. 20 new bands per month is certainly excessive, but with the radio long-dead, how do you discover new music without some kind of streaming service?
You have to actually look not just get spoon fed by the algorithm. Community is how you find music. Subreddits, forums, record stores. You find reviewers with similar tastes and see what they like. You search “bands like X” on the Internet. You keep up with artists you like and watch for new albums. It’s more active than just letting the algorithm feed you stuff but it works. Also radio still exists and public radio especially is still great for discovery.
Or if you’re ripping your CDs and listening via apps you can just scrobble and get algo recommendations still while owning your music and without a monthly fee.
Music stores still exist. Many of them have setups that let you listen to clips from new albums as well. You can also buy secondhand albums at thrift stores and pawn shops, or trade with others.
Friends might mention a band they enjoy, or you might hear a snippet on a video and look into it. Movie soundtracks occasionally have great music from well-established bands I've never heard of.
And you can go to live shows and check out local artists, buy their merch if they're any good.
Streaming is not the only way. Never has been, and never will be.
As far as your first question, is that a good thing, it's entirely subjective. But listening to a full album when you only "like" one song on it will expose you to new music, and might broaden your horizons or help you develop taste.
