Reflecting on it now, it indeed doesn't seem quite reasonable...
The Empress Dowager meticulously recollected some details from the time when the Capital City was built.
First was the issue of location selection. Even if there was a need to avoid the diehard loyalists of the King of Qin in Tiandu, there were still many better options for the Royal Capital of Great Jin. However, the Emperor chose Jingguan, a place previously obscure, as the capital. It was a bitterly cold place and close to the buffer zone of the Northern Wasteland. At that time, the Youyun Region was entirely in the hands of the Northern countries; once they crossed Yanbei Pass, the enemy's cavalry could sweep across the land, directly threatening the heartland of the Imperial City.
Such a place as the Capital City was opposed by both civil and military officials at the time.