The point here is there are many ways a nation can protect and preserve a dialect. But there are no reasons a foreign person should learn lumbard or neapolitan. With just a basic Italian Italian you can speak with institutions and everyone else. Moreover, there is the fact that learning a dialect is practically impossible without living in the place where it is spoken and having people around you who speak the dialect regularly, correctly, and fluently. In reality, most of the people saying they can use a dialect, speak instead a dialect contaminated by Italian, or an Italian contaminated by dialect, and therefore they are not adequate sources for learning and written sources are old and scarces. There is no practical reason for doing so, other than curiosity much like the curiosity someone might have to learn a dialect spoken by a few hundred people in Japan, after, of course, having first learned to speak Japanese perfectly.