The main benefits may be:1. Reward for re-attending a missed event.2. Reexperience the joy of pioneering.3. There is a short rest period to accumulate resources or soldiers.But there are also disadvantages:1. If you are not lucky, you will also meet immigrants from different regions.2. Everything about the alliance is starting over.3. There may be many new players and they need to be re-taught how to play this game.