Archer are nothing we have to worry about. In PB91 did we kill 75 Barbs (and a few animals) and no Archer.
We did kill 1 Player unit, the chariot.
Archery is in the civforum-meta not a popular tech. Archers are not a good unit, Longbows (and Crossbows) are similar. If I have to research Archery for these units, I already lost the game. Horsearchers are perhaps somewhat underestimated, but not very popular.