Likewise in AOK, the Vikings could only upgrade their towers to watch towers, too.
The reason for this is simple, and not necessarily because of diversity. As many of you know, the Norse were a very aggressive culture who enjoyed marauding and plundering--in fact, their entire religion was based on the valor of dying in battle.
By making Norse towers the weakest, you make their defense the weakest; thus, the Norse must use offense as defense--realism! The Norse also have weaker buildings for the exact same reason.
As for the Egyptians, they obtain a unique line of towers. They are able to upgrade and construct ballistic towers--the strongest towers in the game. This was done because the Egyptians were known for their defenses. They were never really an aggressive culture.
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***********************************[This message has been edited by Halo (edited 10-31-2003 @ 01:32 AM).]