Bungie subscribes to the game design bible of "less information protects the unskilled/unknowledgeable player." This is a literal thing where a game intentionally keeps key information hidden from the player so they don't know if they're actually optimal or not, hoping that they feel satisfied with their performance. Without objective evidence showing they're suboptimal, they're less likely to "feel bad" about their specific random loot, reducing frustration due to ignorance. It's an old design philosophy that doesn't really work in the modern era where data is easily accessible through API combing and general testing against mobs, but they're going to keep doing it. Remember how long it took for the weapon stat UI to be expanded? Now remember that they instituted "deterministic recoil" to make the recoil stat on new weapons effectively meaningless? Hidden data is what Bungie wants.