Working with numbers does not count the feeling we have when we "live" in our cities. Surely the devs have accounts of their own, but they might have things organised in a different way. Or five different ways which are still different from our way. It becomes difficult to take into consideration every option that comes up any head. And the more it is worth to be careful with nerfing. You might be destroying frogs home when you dry a small pool to build a firm road...
When each of us receives the same toy, shall we play one and the same game?
Is counting four dalls and one bear the only and totally the best way to play with them?
I think not.
Playing this game is actually "living" in our cities, all that we experience between upgrades and chapter questing. Counting up balance is definitly not the only satisfaction we get. Sometimes you get something you dont need right now, but its a good thing and you like it and you enjoy just the emotion, wow, i got it! Or you might like the way you positioned your buildings. Or a thousand other things, like income of a particular resource.