There are a couple of dynamics that make polishing a mid-game focus.
* Advanced players don't really need any more Coins, Supplies, nor Goods, so they're not an incentive
* Inactive players abound, mostly because we're still seeing a high percentage bump and runs. Once we get a couple more new worlds, we won't see as much of that in the older worlds.
* The known memory leak, and the reloads, take a lot of time
* We've been spoiled by Forge of Empires where we can conveniently Aid cities by walking down the Event History, wherein we can return the favor without the need to actually load each city.
I suspect that it won't take all that long for the Hands Icon in the Notification log to be dynamic, so that you can tell if you've visited somebody recently, and that we'll be able to aid cities without an actual visit and/or visit them and automatically return to the right place in the notification window.
So there are several reasons to expect that visiting the neighbors will become a more pleasant experience once the frosting is on the cake. I'm really very excited about features that will promote lively neighborhoods.