To be honest, I'm not too sure what options the Italians and Slavs have on open maps.
Italians save 50 food while getting into Feudal age, but that's not enough for any rush of any kind. Maybe they could do a fast castle? They save 150 resources when fast castling. But once they're in castle age, then what?
For Slavs, the military building providing +5 to pop space helps, but for which kind of rush? The farm bonus may help, but at only 8%, it's not enough. Can they do a fast castle + UU?
Italians save 50 food while getting into Feudal age, but that's not enough for any rush of any kind. Maybe they could do a fast castle? They save 150 resources when fast castling. But once they're in castle age, then what?
For Slavs, the military building providing +5 to pop space helps, but for which kind of rush? The farm bonus may help, but at only 8%, it's not enough. Can they do a fast castle + UU?