Why is the meaning of Shanxi dialect difficult to understand?

Once Taiyuan dialect was very close to Mandarin. But in Taiyuan, communication is basically Mandarin. Of course, my Mandarin is a little less "Shanxi accent" than theirs. Many Taiyuan people speak Taiyuan dialect, which sounds no different from Mandarin, and it is not as pure as what the 70-year-old grandmother said (it is really "inappropriate" to say "hometown" in Taiyuan). Now Taiyuan dialect is clearly "Taiyuan" Shanxi dialect. Taiyuan people separate Taiyuan dialect from Shanxi dialect and never say that they speak Shanxi dialect. In other areas, they call their language "local dialect" and hope that their children will not speak a local dialect. It is really because they are backward in education that it is easy to say that they are not all descendants of Sangxi, so they will shrink Mandarin out of nia. However, Taiyuan people never tire of it. In fact, Taiyuan dialect, once the standard language of Shanxi dialect, has already become "Taipu". Shanxi dialect has no historical background of Minnan dialect, no urban support of Cantonese (Guangzhou and Hong Kong), no affinity of Northeast dialect and no charm of Sichuan dialect. Mr. Li Rong, a taxonomist of Shanxi dialect, once said: "Shanxi dialect is as rich as Shanxi coal." It is divided into six pieces. (1) Central dialect: including the dialects of Taiyuan, Qingxu, Yuci, Taigu, Wenshui, Jiaocheng, Qixian, Pingyao, Xiaoyi, Jiexiu, Shouyang, Yushe, Loufan, Lingshi, Yuxian, Yangqu, Yangquan, Pingding, Xiyang, Heshun and Zuo Quan; (2) Western dialects: including dialects of Lishi, Fenyang, Zhongyang, Liulin, Linxian, Fangshan, Lanxian, Jingle, Xingxian, Shilou, Xixian, Daning, Yonghe, Puxian and Fenxi; (3) Southeast dialects: including Changzhi, Lucheng, Licheng, Pingshun, Huguan, Tunliu, Changzi, Qinyuan, Qinxian, Wuxiang, xiang yuan, Jincheng, Yangcheng, Lingchuan and Gaoping dialects; (4) Northern dialects include: Datong, Yanggao, Tianzhen, Huairen, Zuoyun, Youyu, Yingxian, Yin Shan, Fan Shi, Xinzhou, Dingxiang, Yuanping, Wutai, Daixian, Shuozhou, Pinglu, Hunyuan, Lingqiu, Shenchi, Ningwu, Wuzhai and Kelan. (5) Southern dialects: Yuncheng, Ruicheng, Yongji, Pinglu, Linyi, Wanrong, Hejin, Xiangning, Jixian, Houma, Qinshui, Xiaxian, Wenxi, Yuanqu, Jishan, Xinjiang, Jiangxian, Xiangfen, Linfen, Yicheng, Fushan, Guxian and Yicheng. (6) Northeast dialect: Guangling has only one county dialect.