You could, but it's basically an echo chamber of music. I know services offer discovery, but I often switch songs instantly, whereas if its on the radio, I'm forced to listen to it, and songs often grow on me.
I like my collection, but I want it to grow, and over the years my musical tastes have matured and changed as I've discovered and listened to more varieties of more genres.
Something I've explained to my kids is that you need to know what you don't like in order to better refine and describe what you do like - and this means listening to music that doesn't 'spark joy', because it's educational, and I care about my musical knowledge and journey. Listening to music selected by someone else allows that journey to continue and branch off into unexpected places.
