If you can obtain the utopia without complete control over the populace, then it is good. However, as of now, the only way to eliminate the war, pain, suffering, hate, jealousy, angst, and conflict is to have a totalitarian control over everyone's mind and eliminate free will.
But note thee was pain and suffering in the Giver world. What was the reason for their aircraft? prevention of war. They had the basics of friendship and no real family. No love, no close bonds. They killed infants with no issues. The elderly were killed with no one caring.
Like most utopias, it appears to be technologically stagnant. No one can be working on new technologies because if they were they would need to understand how everything works. Without the ability to solve unforeseen problems they probably won't be able to adapt and evolve and will eventually go extinct.
No attempt at utopia has ever worked, anywhere, at any time. Utopia always fails. People do not have equal potential and ability. To constrain them to a system where there is no incentive to excel or compete is futile. Add in inevitable corruption, and it will never succeed.