AAF doesn't necessarily have that choice as a private company, and the two-level Metrorail/Metromover transfer is a key lynchpin of the Miami transit system.
Doing a high platform also allows for two levels of retail below the tracks; this is much cheaper/easier than putting retail above the tracks.
From an urban design standpoint, the tall station is just so massive. The design seems to be good so I don't have a problem with it - the transit hub of a major metropolis like SoFla should be huge to correspond with its importance.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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