I have found being able to sight read relatively easily to unlock a vast trove of music I'd like to be able to play which would have been harder to pick up purely by ear. It's definitely worth learning the things you're talking about. I found the surest way to get good at that kind of playing is to play with other people. The time dependence of having to keep up with everyone makes the feedback really tight.

Playing with other people also highlights other perhaps unexpected skills. I played in a band for a while and I still retain the skill of reading chords off other player's hands. You also need to be able to respond to someone just shouting "OK, let's go to C minor" in ways that only matter in that context. When you're listening or sight reading, you don't need names.

I agree. Sight reading does open up avenues - and my ultimate goal is improvization. I love to analyze various pieces and understand the functional aspects of tunes - so that I don’t need to rely on reading or remembering.

That is why JazzSkills.com really worked for me. You can find several free videos on their YouTube channel - https://m.youtube.com/@JazzSkills

I almost gave up on learning and playing music after struggling for years / decades - and by happenstance came across JazzSkills few years ago. And since then every single day I get joy in learning and playing music.

For me it's less about melody and harmony than it is about rhythm, I often need to see or notate a syncopated rhythm in order to "get" it. Though that might just mean I haven't internalized a lot of syncopated rhythms.