Haven't watched the video yet but I'm guessing the reasons are:
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Zoning - mixed use zoning and medium density housing are notoriously missing in the US.
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Setbacks/Clear zones - Time and time again, US city planners have widened roads, straightened roads, and removed trees and such, catering towns and cities for driving, rather than building them for humans.
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Parking
Everything on this instance is fantasy. So much so that I legitimately thought it was a fantasy instance for awhile. I find any and all non-fantasy discussion to be really refreshing.
What are you specifically enjoying about TKaM?