Tourism yield on NWs would help in the late game. Just as an added bonus for acquiring a couple of them. They don't improve substantially otherwise and so lose their early game advantages. This was more obvious though in GEM with all the village and mine bonuses available. Would mostly be a flavor issue.
Mostly the balance issue applies to the couple of new ones. Early faith-based NWs though can much more obviously alter game play than the others as that can put a religion in play and make use of a faith-burning belief (pagodas) a little easier once it gets up.
Mostly the balance issue applies to the couple of new ones. Early faith-based NWs though can much more obviously alter game play than the others as that can put a religion in play and make use of a faith-burning belief (pagodas) a little easier once it gets up.