How would it affect the civ if 1/5 of the effect of Druzhina was split off of the tech, and added to Slav infantry from the start of the game (or if that’s too strong, Feudal)?
This could be roughly comparable to Burmese and Magyars in Feudal (with large infantry blobs being relatively rare), and keep pace or surpass the Burmese bonus in the later game (depending on the size of melee fights). In other words, I don’t think it would be overpowered, but it would be useful, giving Slav infantry an interesting advantage from the start of the game.