Faced with Stephanie's doubts, Roland explained, "Building a floating city requires a very secretive environment, otherwise the initial construction of the floating base can easily be destroyed. The world has no shortage of particularly jealous people."
Stephanie thought that Roland's concern was natural.
If she knew that someone she didn't like was building a floating city, she would definitely think of a way to destroy it before they became too powerful.
Not to mention that there were quite a few people who didn't want others to succeed.