Using a secret realm as a dojo has countless benefits.
For example:
The environment within the dojo can be transformed at will, reaching maximum comfort for living.
While the real world may be ravaged by storms, inside the dojo it remains always sunny and windless;
Outside may be scorching, but inside the dojo it's gently drizzling, with misty rain.
Furthermore:
The secret realm is essentially an independent space, attached to Canglan Star, therefore its entrance can be placed anywhere within Xiaoya's control.
This means if you want to move, you can relocate to another place at any time.
This month, you might place the entrance on Kunlun Mountain, and next month move to an island in the Southern Ocean.
During the last global tsunami, the Southern Ocean region on East Continent was severely affected and many islands became uninhabited.
Without hesitation, Great Xia took over no less than 1000 uninhabited islands under the guise of "disaster relief."
