I didn't say that you can't build inland cities, just that costal/river ones have benifits so that they tend to be larger and build more often. In your examples how large are theose trade cities compared to Rome/Shanghai/Alexandria during the same era?
The vast majority of large cities are still costal or on a major river. A spot where you have both is the best, bonuses get combined.
Your point on not all costal cities getting the bonus:
Trade routes are created be people. By the very fact that you settled a city there, there will be trade. The existence of the city creates the bonus. Not all ocean cities will be huge, lots of other factors can keep them small.
For a pair of otherwise identical cities the costal/river city will always have more trade. External factors can change this, like trade routes, but costal cities do have an advantage.
Having a trade bonus represents the ease of access and implicit trade to smaller population centers around the nearby coast. Inland cities do not have this until RR, but you can still establsih trade routes.
------------------
"Any technology, sufficiently advanced,
is indistinguishable from magic"
-Arthur C. Clark
The vast majority of large cities are still costal or on a major river. A spot where you have both is the best, bonuses get combined.
Your point on not all costal cities getting the bonus:
Trade routes are created be people. By the very fact that you settled a city there, there will be trade. The existence of the city creates the bonus. Not all ocean cities will be huge, lots of other factors can keep them small.
For a pair of otherwise identical cities the costal/river city will always have more trade. External factors can change this, like trade routes, but costal cities do have an advantage.
Having a trade bonus represents the ease of access and implicit trade to smaller population centers around the nearby coast. Inland cities do not have this until RR, but you can still establsih trade routes.
------------------
"Any technology, sufficiently advanced,
is indistinguishable from magic"
-Arthur C. Clark
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