They definitely need to look at industry, resources and how the whole thing works and links together and effects the city. It looked rushed at release and they havent touched it since.
The simulation bit seems to have taken a backseat while the cosmetics and novelty took over. There needs to be a direct link between jobs and wealth, offices need to do something other than being a prettier industry. A city doesnt just build dirty industry till it gets to a certain size to unlock offices then bulldozes it all and turns it into offices like its exactly the same. You should need to build slowly, need to exploit resources, develop into a prospourous city.
Stuff should require demand, that may sound stupid to say in a city builder, but you can basically do what you please in this, build what you want, you pick and chose how rich to make your sims just by surrounding them in services, its harder to make poor sims than mega rich, even if theres unemployment coming out of your eyeballs, youve done everything you can wrong, the only jobs are working in a carwash and every other real city would be a haven for criminals and graffiti everywhere, your city is a forest of shining towers of pristine glass buildings and a paradise of top level skyscarpers and mansions.
RCI shouldnt be just decoration, ignore it if you want. Having no suitable jobs but plenty of services around your res shouldnt attract top level res. It shouldnt be a case of just building anything you want and fast forwarding time to watch it turn into top wealth whatever. In simcity 4 low wealth jobs created a demand for low wealth sims and high wealth jobs high wealth sims. In this all sims are whatever you want them to be. You turn them into whatever you want them to be. There is no wealth classes.
If they made the AI better there wouldnt be the need for 1,000s of transport options. People want more and more transport options not realising its as a work around to try and get smarter better working transport. How come they cant work a roundabout? Its pre made option to build roundabouts yet they dont work. Been that way since launch.