Why some civilizations have 2 unique unit but somes not have ?

Well that is what is displayed as of now on the website, but, of course, we can't know that for sure. Maybe they're only giving us part of the info (like, for example, we have no idea what the special abilities do). If it were the case that some civilizations have two unique units, then it's apparent that they'd like those civilizations to be a bit more war-focused than UU+UB counterparts. Whether or not this will be balanced we can only wait and see.
 
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