Why are some items locked or greyed out in Merge Dragons and how do I unlock them?

Some items are locked or greyed out because they require specific actions or achievements to unlock. You can unlock them by completing quests, events, or specific tasks.

Some items are locked or greyed out in Merge Dragons because they require specific actions or achievements to unlock. You can unlock them by completing quests, events, or specific tasks.

- Complete quests - Participate in events - Achieve specific tasks to unlock items

I'm not convinced that unlocking these items is worth the effort. Seems like a lot of unnecessary work.