Interesting, I didn't take this into account when making the mod. Well I feel Babylon is already pretty powerful, this is just a slap on the wrist. Just don't turn this on when playing Babylon.

Haven't played with this mod; and I am biased as I enjoy the civilization I am about to speak on.

The Babylon Bowman was a nice in-between unit, with the Ranged Strength being in the exact middle between the Archer and Composite Bowman (and the Combat Strength was equal to the Composite Bowman).

By furthering the gap between the Archer and the Composite Bowman, but not altering the thing in-between, you slightly debuff a Unique Unit. The benefit of Babylon's bowman is that it doesn't necessarily need to be upgraded to Composite Bowman immediately if you're trying to focus on early game development to prepare for mid-late game; yet the Bowman can still hold some defense in the era of Composite Bowmen.