No, no, I just made a poor choice of words there.
Hmmm...
I'd have to say that I wouldn't be in favor of that, assuming that the XP bonuses from buildings and World Wonders stays constant.
Why? Because such a reduction in experience prereqs makes it possible to churn out Level 2 units upon researching Bronze Working, and Level 3 units upon researching Machinery.
In short, it would make beelining to the Military Tradition social policy THE clearly superior cultural choice for Ancient/Classical era domination rushes. Is that a bad thing? In my opinion, yes.
In a somewhat related topic, I wish there was more incentive to build Military Academy than just a flat +15 XP on top of the +30 from Barracks and Armory.
Yes, I realize that experience doesn't exist in a void, that there's a huge difference between the +15 experience that the Barracks provides and the +15 experience that an Armory provides. However, the Military Academy doesn't unlock any new experience levels. If I'm shelling out 300 hammers for an experience building, you can bet that I'd want it to unlock an experience level that the previous experience building didn't already unlock.
I'd be more satisfied if each experience building/World Wonder unlocked a new level, rather than provide a flat amount of experience. What do you guys think?