Also, you forgot that diamond has WAYYY higher durability, so the enchants you make will be more worth it because the tools and armor will last longer than iron.
If you want to have an incentive to explore, try FTB Blood and Bones. You need to explore, or you'll die from hunger on the first day (most food can only restore half a hunger bar, and you don't heal naturally (you must eat specific food to heal). You need to go around and find things like strawberries and blueberries so you can start a farm).
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