Fenggang Town in Dongguan and Longgang District in Shenzhen live next to each other. Why isolate them?

Dongguan has 4 sub-district offices (districts) and 28 towns. The area and administrative level of the districts and towns here are the same. There is no inclusion relationship. Unlike a district in China that contains many towns. Because Dongguan is very small. It used to be called Dongguan County. The four districts of Dongguan constitute the urban area of Dongguan. In fact, many town centers in Dongguan are worse than urban areas. Such as economic strength. The first and second places are Humen and Chang 'an respectively. None of the four districts can match. There is also the tallest building in Humen Town. Most five-star hotels are out of town. It's Houjie. The train station is not in the city either. In Changping town. The most beautiful and technologically advanced place is not in the city. It's Songshan Lake. Dongguan. It's really weird. Create many miracles.