But as for your other point, I wondered that too. Why do we need to pursue hospitals and pollution and consequently mass transit systems and recycling centers...IF...we could just equal the number of happy citizens through a tighter spacing scheme? Though there may be a good answer for that specific question, I do there is plenty of legitimate debate left in the issue of city spacing and similar expansion and gameplan issues, since we can find no real consensus amongst milking runs other than a few vague trends (which are often thrown out anyway in favor of better placement to fresh water, resources, etc.).
-Elear
I'm certainly no expert, but I can get a 9 tile city (no culture expansion) up to size 19, so I don't think tighter spacing is even relevant to the conversation unless you're contemplating ics (CxC).