It's questionable whether local governments should spend money on such projects when there is already sufficient infrastructure, especially in the current economic climate. On the other hand: this is not a bridge in Guizhou -- the greater bay area is the backbone of China's economy and innovation potential. Greater connectivity between cities (which reduces felt distance, and massively helps to integrate these cities) could have massive benefits. Having the world's first high-usage, long-distance, and truly high-speed maglev also has reputational implications, of course.
