Zhetian's Eternal Star Region had mecha Gundams, but their materials were divine iron or even immortal gold. They also needed to be imprinted with a cultivator's Dao and principles, and consumed the pilot's magical power.
Otherwise, a mech forged purely from immortal gold would still be destroyed along with its pilot after being struck by an Imperial weapon.
Besides that, goblin technology, soul-guided tools and battle armor, Hextech... No matter the technological system, once it involved advanced levels, both the materials and energy needed to be of a sufficiently high grade.
If it were to rival the rapidly escalating combat power of cultivation systems, it would at least need a technology tree on the level of Stellaris, or reach the standard of the Singer civilization. Even the Three-Body civilization would not quite be enough.
Rather than hoping for nuclear bombs or aircraft carriers, Tiga was more interested in whether this world's aliens could bring out some advanced technology. This world had fourth-kind encounters—that was, extraterrestrial life.
When Chen Duo had been young in the Dark Fortress, she had met a child who had experienced a fourth-kind encounter. His name was Chen Junyan. Even Chen Duo's name had been given to her by him. Later, he had been taken away by a department specifically responsible for matters related to aliens.
Before becoming a temporary worker, Wang Zhenqiu, the scourge of the Southwest, had worked in that department. Of course, that was no longer a story from Under One Person...
In any case, Tiga still had certain expectations for this world. Using it as a foundation, he might be able to help advance the entire experiment, while gaining something in the process as well.
For example, deriving methods. The process of extrapolating what he had learned into something suitable for this world