Many of the screenshots that you are seeing with very tight city placement are from games where the corruption model has been altered.
Under the standard rules lots more cities means lots more corruption. If corruption is eliminated or the OCN (optimal city number) increased, then building lots of cities becomes a much more attractive strategy.
Furthermore, since the AI can't change the way it places cities in response to these changes, it tends to do less well under these mods. So, the human players are able to beat the game at higher levels than they would under the standard corruption model.
It's an invisible change to the rules that some people like because they want huge, globe (cylinder?) spanning military civ's where every newly conquered city adds fully to the empire. But it has an enormous impact on what constitutes a reasonable strategy.
There are high level players who tightly pack cities on the standard rules, but a lot of what you're seeing is people playing a very different game.
Under the standard rules lots more cities means lots more corruption. If corruption is eliminated or the OCN (optimal city number) increased, then building lots of cities becomes a much more attractive strategy.
Furthermore, since the AI can't change the way it places cities in response to these changes, it tends to do less well under these mods. So, the human players are able to beat the game at higher levels than they would under the standard corruption model.
It's an invisible change to the rules that some people like because they want huge, globe (cylinder?) spanning military civ's where every newly conquered city adds fully to the empire. But it has an enormous impact on what constitutes a reasonable strategy.
There are high level players who tightly pack cities on the standard rules, but a lot of what you're seeing is people playing a very different game.