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Trivial change is easy, but useless. Nontrivial change is useful, but hard. Converging languages fall in the first category. The languages are already so similar there's little to gain for either of them. They both have all the same capabilities. Most of the difference amounts to trivial stuff like a few different words or different pronounciation. In the communal case they just quickly learn to understand each other but keep their mother tongue. The mild case of this is dialects.
