I don't miss it at all. I was a warrior main until late Stormblood. I always found it more confusing and annoying than anything. I don't think aggro is a super interesting mechanic in really any game. That said, it was one more thing to keep in mind and they didn't add anything to occupy tanks when they removed it. I would like something to make tanks feel more like tanks than invincible melee DPS. Maybe more interactivity with defensive kits or something.