Additionally, this make the charisma stat relevant again. What effect do NPC, sovereign or offspring have on your problem? And the "fertility" spell is suddenly a bit more valuable. And inns, pubs, theaters, and the (if you can reach level 5) the great arena.
Not really that I can see.
In a different game I have a been leveling up charisma and have the following city (11 total cities)
Buildings: hub(1), Beacon of hope(1), inn(1) + Fertility (1) =4 prestige with royalty (+10%) = 4.4 prestige
5 Heroes charisma scores 10,8,25,22,12 = 5.8 prestige
No multi-city penalty shown ?
Net prestige production 10.2
The City's prestige is 0.1
It is season 184 I have two starting capitals mine with 195 population and an AIs with 112 population