I would agree with this, if it was implemented in such a way, that money income actually begins to matter in this game. Then it would make sense to expand the management of the city beyond zoning and plopping, which is what we're basically having now.
SC4 at least tried to bring in sliders for public services and their advisor tension (which brings life into the game btw), which could be improved upon.
Random events could've been added to CSL (much like those in EU4 if you Will), improved-upon advisory communication like in SC4, with even more diplomacy with unions, political groups perhaps, maybe even elections like in Tropico series, all to breath in a sense of actual mayoral function, to bring life into the game, a sense of duty, that the player should feel to have for himself, for the city finances and for the community at large.
That is just my opinion on what I think this game is fully missing on to fully become a real classic of the genre.