Just as a wolf becomes a dog, the Southern Border People have bred the worm into a "hunting dog" only their tribe can control; in the hands of others, it remains a wild wolf.
Although some exceptions may tame the "wild wolf," there's no method to turn it into a widely-spread "technique" like the River Dolphin at the Fishing Tax Office.
This is one of the reasons why the Central Plains want to catch up but can't; they can't obtain the latest samples to innovate independently.
Starting from scratch, there are fewer researchers than in the Southern Frontier; only a few southern provinces are willing to give it a try. Even with Imperial Court support, progress doesn't compare to the Ten-Thousand Mountain Range, and instead, it's a case of imitating without leveraging their own advantages.
Moreover, the Southern Frontier's climate is itself a feature, yielding twice the result with half the effort.
Everyone relies on their own skills to compete.
