Technology, often, is reminiscent of concepts interrelated; despite the lack of production of similar weapons due to various reasons for the time being, many people have already guessed the principles behind them.
The indigenous people of this world are not fools; they have already demonstrated their own research and development capabilities by inventing flintlock guns. It was merely the appearance of Tang Mo that accelerated technological advancement, leaving the indigenous peoples' theoretical knowledge lagging behind the pace of progress, resulting in a technological monopoly.
If given time, these indigenous peoples, once they grasp these technologies and integrate them, would also continue to develop along the technological trajectory, eventually coming up with similar products.
For instance, in a place unknown to Tang Mo, the technical department of the Dorne Empire already dabbled with something like rocket-propelled grenades on their own.
