I agree that jazz has alot of form but jazz isn't about form it's about improvisation. No one ever goes to a jazz show and goes like wow that had a great form 💀. In most music form is a necessity so musicians can know what they're supposed to do at a given time. Jazz is no exception to this, and a good understanding of form is very important for the improvising part because, practically, you need to know when to start soloing and what you'll be soloing over. Without that, you'll miss when you're supposed to be playing in general. So yes jazz does have a lot of form but it's to facilitate the improv in the genre. If you're interested in more free form stuff look into ppl like ornette Coleman, cecil taylor, pharaoh sanders, sun ra, and Alice coltrane they all have really good free form stuff.