Many people nodded slightly, their expressions solemn.
Indeed.
In contrast with simple intelligence gathering, which can be easily investigated, there's the indigenous reconnaissance with almost cheat-like "coordinate locking" abilities of the Emperor. Trial civilizations, especially powerful ones, are undeniably extremely challenging.
The difficulty between the two is, in fact, incomparable.
*You simply have no idea what kind of equipment, talents, abilities, or even the foundation of the opposing civilization might entail.*
*Without being able to predict their methods, it's hard to guarantee success.*
Of course, the reverse is true as well.
The opposing side must exercise caution; otherwise, they wouldn't resort to advancing their moves on the intelligence front.