Oh, yeah. I forgot u can do that...
Speed and stealth. If you skilled and equipped your fleet correctly it is easy enough. But if you got the wrong skills it is wrong. You would not take a Formular 1 car for offroad right? Bringing the wrong fleet is the same.
If you use a fat fleet with civilian grade hulls you can be seen from quite a distance. Fat fleets are not fast and turn slowly.
A single Revenant phase ship can be seen only if the enemy fleets almost sits on it. Combined with a burn level of 7 when going dark and the increased mobility of a single ship (compared to sluggish movement of larger fleets) it is enough to do it with ease. Try it. It requires no real skill.
This gets old really fast. I don't want to travel back and forth to deposit my entire fleet and cargo, do the spysat, now pick up my fleet and cargo, place every single ship in desired order in the fleet sheet, assign every single officer, then do it again every time new spysat comes up. The reward is virtually a spare change late-game and there are better things to do specifically for relationships points.
If you use a small fleet its easy money otherwise you are free to choose missions which fit your current fleet. Why complain about the possibility to choose a mission which could be done with 1 ship when no one even forces you to do this?