MagisterCultuum
Great Sage
Like Arctem said, there is no problem but clutter. I'm not so sure it would be that big of a deal though, and doubt you would end up changing everything back instead of just a few units that you never build later in the game.
The only problem I can think of is that the AI might build more otherwise obsolete units. They already seem to like warriors, but this is probably just because of the building requirements. I still think that all buildings should provide some bonus (xp, happiness, defense, trade, etc) that would make the AI build them instead of just using the no ai building requirements option.
The only problem I can think of is that the AI might build more otherwise obsolete units. They already seem to like warriors, but this is probably just because of the building requirements. I still think that all buildings should provide some bonus (xp, happiness, defense, trade, etc) that would make the AI build them instead of just using the no ai building requirements option.