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Why does the silence of H exist in French?

In order to have more diversified vocabulary, for example, heure is an hour, while eure is a place name in France. Think about what would happen without H. Many words will be repeated. Not pronouncing is just for the convenience of pronouncing the whole sentence, and it doesn't mean that it is meaningless except for pronouncing. Just like the e at the end of many words is not pronounced, but what do you think will happen if it is removed?