By 'precise' I think you mean 'easy'. And I agree that it's a bit tougher to try to work with balance from tweaking the small portions that make up the whole. But I think DH's point is pretty solid. Why should I lose gold just because I discovered a new technology?
Because it costs money to educate people? Or it costs money to have Feudalism?
I could support adding -
to more buildings in the Medieval era, but that is as you said a lot more work, and I think we'd all rather spend our time on other things.

)