Money, always short of money.
The Heart of Civilization in Right Hand contains countless technologies ahead of its time, but...
It's like asking a caveman to build an airplane. Apart from whether they can comprehend the knowledge and technical data, where would they get the tens of thousands of parts needed to construct the aircraft?
Without machinery and various types of forging equipment, how can it be built?
And what about the aviation fuel required by the aircraft, how to refine it?
Right Hand is like a professor returned to the era of savages. Despite having loads of technical knowledge, it is forced to begrudgingly join the cavemen in fishing in the river, and it's already quite impressive to make nets and fishing rods.
Breeding new varieties of rice to plant, mass production? Don't even think about it.
Limited by the technical level of this era, first, it can't be implemented; second, these technologies are too shocking. Chen Yang cannot possibly use them.