"Hehe, when the time comes, don't tell our lord, just let him enter this sealed area and give him a surprise..."
The arrival of Star Moon was primarily based on the progress of the internal repair projects in Xianyang City, to analyze the specifics and issue new instructions to Xianyang accordingly.
Like a supervisor, the remaining tasks were basically for Xianyang to complete on its own. In this regard, Xianyang, birthed from a copy of the Nvwa program and combined with a multitude of Federation engineering-related intelligent program experience and all blueprint information from other Federation base constructions, including encountered issues and corresponding solutions during construction projects.
Apart from not being able to think autonomously like Star Moon, Xianyang was more professional than Star Moon in some aspects.
Moreover, Xianyang wouldn't feel lonely. Without emotions, it was a merciless repair machine—in fact, that's what it was originally.