True, there were separate uniforms for the enlisted in the TOS movies, but many people missed the point and thought they were meant to be cadet uniforms, to the extent that in Nemesis we see Tom Hardy dressed in one in the photo of him as Cadet Picard.TOS-Movies had separate uniforms and rank insignia (and even different Federation insignia--the bronze Enterprise delta with a circle while the Officers had a bronze delta with the circle and the bar behind it). TNG (through Voy?) had enlisted ranks, but no unique uniforms, perhaps in an effort to promote equality.
The 24th century uniforms made no real effort at enlisted insignia. The first real attempt is that silly single hollow pip O'Brien started wearing in his last few TNG appearances and the first few seasons of DS9. Eventually, that got replaced with a new rank pin that with chevrons, but they didn't create any of those for the other enlisted ranks. Indeed, most enlisted are simply represented by no rank insignia at all in the 24th century. Enterprise actually did create insignia for all the enlisted ranks when it started, though by the third season those were largely ignored except for whenever Mr. Daniels decided to wear his uniform on his visits as opposed to that silly stillsuit knock-off that represented his future wardrobe.