In one sense jazz is all about freedom - you can play "whatever you want!"- but in many other senses it's as incredibly traditional and formulaic.as classical. There is a canon of songs that is worshipped, and song structures and instrument combos are mostly frozen in amber, and there are lines you just cannot cross. Every genre gets like that after awhile I guess.
I'll go as far as to say that the entire modern jazz movement recognizes earlier jazz (swing/bebop/cool/funk) as seminal to the art form, but deliberately experiments and takes risks away from classical jazz forms.