栃木県はなぜ閉鎖的なのか？

うp主の地元栃木県はよく閉鎖的な県と言われます。
一体なぜなのか不満なので、調べてみました。
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Images:
Nasu Kogen Service Area (inbound line) 20220422b by 掬茶, CC BY-SA 4.0 (https://commons.wikimedia.org/wiki/File:Nasu_Kogen_Service_Area_(inbound_line)_20220422b.jpg)
Nikko toshogu shrine by Koichi Sato, CC BY-SA 4.0 (https://commons.wikimedia.org/wiki/File:Nikko_toshogu_shrine.jpg)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (20) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49884296528/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (17) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49884296798/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (07) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49884297413/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (04) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49884297743/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (06) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49884822211/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (11) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49885130637/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (08) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49885130797/)
Ashikaga Flower Park, Tochigi Prefecture; May 2019 (02) by 雷太, CC BY 2.0 (https://www.flickr.com/photos/128275472@N07/49885131227/)