Does Halo: Fireteam Raven features homing rockets? If so, then homing rockets should so appear in Halo CE. Also, leading the shots isn't always easy.
You're confusing lore importance with gameplay importance. People who go back to play Halo CE are not going to be going back looking for homing rockets. There are plenty of people who, unlike you, have no desire for homing rockets at all. They want the game to be exactly like how it was when they first played it. No amount of supportive lore would ever change what they want from their gameplay experience, and seeing as that makes it a lose-lose situation to add them in or not (for microsoft), it's highly doubtful you'd ever see them being added in any official capacity.