Constant improvements, as my friends above have said. But I'm not entirely sure FD ever intended background simulation to be significantly impacted by an individual. In fact, I'm sure the intent was to require a concerted effort from larger volumes of players.
I dunno. It seems like the intent should be like you say for large systems with a station. But for Tiny pop systems with 2 or 3 outposts, why not? Seems plausible to me.
Wouldn't that be the same idea as trade is now? Once you get bigger ships, you have to move on to larger systems with more supply. I used to want to protect my trade route in my Cobra and later in another system with my T7, but those same routes are useless to me now in an Anaconda. It lets a smaller trader survive and prosper, in the same way Tiny pop systems might give lone wolves something to do.
And if the intent of FD is to not allow single folks to impact any system politics, then stop showing % influence changes when running missions. All that should happen and be shown is your status with that faction going up/down, not any influence changes between the factions themselves.