I was just watching some commentary by Quill18 on his pre-release version and it occurred to me that we may have a problem with a lack of global happiness mechanics resulting in runaway city spamming. To some extent in civ6, local city happiness and housing space should limit city sizes, but with Civ5's "global happiness (-) population generated unhappiness (=) expansion limit" formula now gone, what prevents city spammers? Now, user based choices will still have major effect as buildings, wonders, and military are definitely important. And no matter how easy it is, if you get stuck on a border with Montezuma, city expansion takes a back seat to the military. There's also apparently an exponential increase for each subsequent settler, but even so, its concerning. One would hope there's still a degree of limitation in playing wide.