Jazz, as most people think of it, flourished in particular during the 1960s-1980s which was a period of radical individual self expression and spiritual enlightenment. (An era in history known as "The Consciousness Revolution"). It was a period of breaking away from the institutionalized, conformist STEM era of the 1930s-1950s. Incidentally, the 1930s-1950s was the period Muzak was created, whose goal was to standardize all genres into inoffensive background music for worker productivity. (Hm, ring a bell these days?) If you listen to a lot of artists like Miles Davis or Bill Evans, their work changed radically by the late 60s. Jazz can exist in any period, but most of the emotionally charged and groundbreaking work was done in this period.
We’re back to the period of conformism, group participation and standardization with negative connotations attached to individualism and subjective self-expression, so art and culture is struggling. It’s not just you, everyone I know in the creative fields has noticed it. There are some artists who continue to push the limits or play with real soul, but they’re mostly underground.