The espionage system is pretty simple right now imo and needs some improvement. I don't have any great ideas but I am just curious to whether we will get a DLC for espionage or not
I would imagine that espionage is something would be improved in a free patch that comes with the DLC because the espionage system affects every single country. The espionage system does need a bit of improvement though, right now the espionage ideas are near useless.
They could need some love yes, but I got real problems thanks to Venice taking those ideas in my very first game - they kept sabotaging my reputation and manged to destroy all my alliances that way - I (Switzerland) have been allied to France from the start of the game until 1780, and after i got the -50 relation hit they cancled the alliance and immediatly switched their opinion oward me to hostile... When I finally manage to get rid of the modifier I get some new alliances up, but as soon as they manage to sabotage me again I loose them pretty fast...
So I'm surprised how effective that action is, at least against the player who partly depends on one or some alliances with AI nations.