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Children need boredom.
Technology has made boredom obsolete, so allowing a child to be bored is depriving them of other skills and traits learned by peers who are never bored.
Some necessary activities are boring, for instance repetitive tasks at work. If they don't learn to cope with boredom, they won't be efficient at those tasks.
Boredom still exists. It always has and it always will. An example would be a 5 year old flipping through 200 channels saying, "There's nothing on TV".