Sounds about right. Streaming is about being able to listen to anything you want. Vynil is about keeping what you like.
My Spotify history is full of songs and playlists which I don't even like, and I use it to explore other genres and artists. It's reasonable that only 5% of everyday people listen to is good enough to be acquired permanently.
Sometimes it’s reversed. Spotify has less than 50% of the artists and albums I have on CDs and I have been tempted to buy missing songs on vinyl. Spotify’s playlists also rot, roughly 1% of songs disappear per year.
