The “archery tradition” technology (available to kush, maur, pers) not only increases archer attack range, which is a clear military bonus, but also lowers their training time by 10%. Because many archers can gather, this effectively gives an economic advantage.
This patch removes the latter, focussing it on the attack range only.
The vision range increase is removed too; archers have a significantly lower attack range than they used to have (see D3297) and their vision range is much higher than their attack range, therefore there is no need for a further increase.
[EDIT] Also reduced its costs to compensate.
Should perhaps the technology be converted into a civilization bonus?