When you own 3 albums, you'll listen to them more often. You will put more effort into memorizing them. You'll listen to the tracks that were not designed to be radio hits by a committee but were instead the songs the band came up with on their own.
You get way more out of your investment when you invest mentally and emotionally into the full spectrum of their music.
This guy is talking about finding 20 new bands a month. He's not getting anything out of it other than a mild dopamine hit, and he thinks he's somehow cool for that?
It's like being a connoisseur of children's cereal and never having home cooked steak and eggs for breakfast. It's like bragging about your weight loss journey because you started smoking crack.
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.
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.
And amplifying that, we see more and more "built for streaming" music, which is not the sort of music I want to listen to. I have phrased that carefully; it is a personal opinion and I won't criticize anyone who discovers that actually, yes, generic AI rock that is pumped out by the hour is something they find some use for. I could see someone who wouldn't want to "listen" to that with intentionality finding it useful to code to or as background noise in their life or something. But it's not what I want, and unless the streaming services do something about it it is what is going to dominate their platforms over time.
I don't go in for super deep relationships with the musicians, reading about their histories and stuff, but I do enjoy the way that the music I like most on first listen often pales quickly and the tracks that I initially didn't like very well become my favorites.