You have to figure that there's probably going to be interference from non-government entities, right? For instance, a corporation that wants to expand their market to fresh homeworlds, or drunk fratboy aliens who decide to go space-cow tipping/mutilating/probing. This probably would get represented through events, as well as the planet's overall wealth or knowledge level?
Which would make it interesting to enforce rules concerning planetary interference. Blocking most civilians from having an influence on a planet would make them far less likely to realize the grand scheme of things, while having looser restrictions could slightly bolster your own economy and maybe raise happiness from all the cheap entertainment derived from reality tv shows your people can install on the planet's unwitting populace.
I mean, come on. Snooki's an alien, you guys.
Until they expose more of the economy and military setups, it is hard to extrapolate what effect, if any, can be had on pops, low tier or high tier civs.
I'm more interested in the Power hierarchy, or what others normally call the food pyramid or the totem pole. Who is superior, who is inferior, and how that interplay works out. Counts over barons. Dukes over counts. Great dukes over dukes. Emperors over dukes. And then there's the special duke that is more powerful than an emperor due to politics.
Having people above you and below, makes for interesting scenarios. Aside from the gameplay ramifications, it's a system that is its own meta game almost.
Once the military system and the economy is exposed a bit more, it'll be easier to see what resources, if any, can be extracted and how manipulative strategies may work in theory. The scripted events and system, I take to be slightly different than the "your own story" that pops up in simulations.
Pdox said something about the POPs being the star of the show, but I can't extrapolate any real conclusions, tentative or not, from that. Even with Victoria 2 as a semi proto comparison to draw off of. I mean that could mean POPs are like dynasties and family members in Crusader Kings II. That would be nice. Or it could mean POPs are crucial to gameplay and dev, like V2, but doesn't require a lot of gameplay fun to interact with. Meaning POPs are distanced from direct interaction by some kind of simulated layer or so, that makes it not easy to micro.