And... will that be a bonus at all? Aqueduct and cultural buildings are always good in any city. But XP buildings not. If the city is mostly guild hub, or university farm with mostly jungle and few hammers that would be waste. Not every city need to be unit manufacture, there is some space for specializacion. And already existing discount is much better for that, since it allows to specializa in this few cities.
Better idea would to give a defensive building, but then again it is better as production discount, since not always you need this defensive building asap, and having free gone waste when city will not see fight for another 50 turns would be a waste.
I agree. Free aqueducts and monuments are huge boosts that act on their own. +% mods to buildings allows for more flexibility and more options to stack (rome ua, workshop/forge/ longhouse.) i feel like quicker defensive/military buildings would be helpful.
Still, i think there should be a policy buffing great generals. Something like a negative modifier to unhappiness when garrisoned.
One thing we have to keep in mind is honors natural synergy with autocracy. The problem, however, is getting the tree competitive with the others.