Well you know, it's not who invents it but who patents it... Or in this case introduces it widely enough to start getting noticed.

True, the Great Hungarian Plain doesn't have enough pastureland for nomads; every folk who remained in the region had to abandon pastoralism inside something like generation. Ditto for China. That never seems to have kept anyone (except possibly the Golden Horde, but they had a fair few other reasons to go away too) from taking them over, though. Maybe they just liked being able to extract tribute from the local farmers, easy access to nearby (relatively) rich settled lands and/or didn't quite realize the long-term implications ?