Comment by guenthert

Hard disagree. There are times when nobody, really nobody, cares about a given type. See the example of std::chrono::steady_clock::now over at cppreference.com. There you have

        const auto start = std::chrono::steady_clock::now();
        do_some_work(size);
        const auto end = std::chrono::steady_clock::now();
        const std::chrono::duration<double> diff = end - start;

        std::cout << "diff = " << diff << "; size = " << size << '\n';

Looking up the (current standard's) return type of std::chrono::steady_clock::now() and spelling it out would serve no purpose here.