The Lunar Base vehicle that could garner such a sigh from Edward Witten is indeed high-tech, but the current base vehicles are still imperfect.
At the launch center to which Yixing belongs, the base vehicle is constantly undergoing testing to ensure that all parts can function normally.
The current base vehicle had just completed its first assembly, and would have to be disassembled and reassembled two more times, with some necessary equipment added.
The most important of these are the safety and replacement devices, such as solid fuel and special solid fuel generators.
This equipment is generally not used, but in the event that the solar energy transmission devices fail, the solid fuel generators become the temporary alternative power source.