300 songs might not sound like many, yet that is how many items have been added to my library or to a playlist in 12 years.

So I can't really speak to anything else than that. That's my usage pattern, yours may be different.

I keep yearly playlists (starting 2023) where I add songs I like and each one is only about 30 songs on average, so that somewhat matches the aggregate number over a decade..

I guess I stick to the things I like and find things I like in DJ sets or on the Gym radio- I'm not investigating new music through subscription services.