Why did the Belgian Parliament pass laws to decentralize its government?

I think that decentralization is a very important process that must fulfill each country. That is why the Belgian Parliament pass laws to decentralize its government. In addition local problems can be effectively tackled only locally. The state never comes to problems of each village or town, every street or courtyard. All post-socialist countries of Central and Eastern Europe have gone decentralization. This is what gave these countries a huge boost for further development.