Noooooh! It's not a bug, it's a feature!
No, it's a bug. Or at least I would consider it a bug.
Seriously, I think it's great. The result is not as dramatic as what a priest can do, there is no "Diplomatic Take Over" for example, but it has the advantage of being covert.
It is realist too, talking to the right people without anyone noticing is what spies do.
So, there's a region with 10,000 people in it. And you're going to spend enough time in the region, talking to enough people, and spreading around enough gold, that you're going to convince enough them that Keplerstan isn't really so bad as all that, and the other nobles in the region
that run with the same crowd are
not going to notice this? But a priest can meet with 30 local peasants, convince maybe two of them to join Keplerism, and everyone in the region, and surrounding regions, notices?