An interesting response to ponder. First, I'm sure you have an above average IQ. As for being a *Sigma, I can't tell from a short post. On the surface, you seem to have some traits, and a streak of curiosity to a certain level, but not to the obsessiveness of a Sigma. Sigmas don't tend to dabble in things. They become immersive. For instance, I've literally read 250+ books on economics, finance and trading. Sounds nuts, but that's a Sigma for you. And that has been just one of my many immersive hobbies. Sigmas would never say "I don't know what I'd do if I retired." Not having anything to do just doesn't register as being a realistic possibility in a world filled with a seemingly unlimited number of things to do.
I can't speak for streaming in your favorite genres, however I thought it would lack with some of my obscure preferences, but it doesn't. So I sold all my LPs and all but a handful of my CDs. I haven't listened to physical media going on two years.
On YouTube, Rick Beato (a former record producer) does some interesting analysis of new music quite often. To say his audience is less enthusiastic than he is is an understatement. But even he has to admit often that new music lacks creativity. His latest Grammy nominees video is a case in point.
*Sigmas can also be determined by the Myers-Briggs INTJ test result, which I took in my early twenties.